Official 4.6L MPG thread - Page 8 - TCCoA Forums

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post #211 of 303 (permalink) Old 01-04-2012, 11:05 PM
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post #212 of 303 (permalink) Old 01-05-2012, 12:07 AM
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Quote:
Originally Posted by theterminator93 View Post
True, but the figures I read out were the low and high averages while cruising. I suppose it'd equate to a highway average.

Once I go through the "proper" estimation procedures by filling up at the pump I'll update my MPG readings. But for now, the scangauge makes me happy.
I agree.

On my '95 Tbird, '07 FX4, and the '01 Mercury GM ..... after using the SGII since Feb 2010 ..... I find that the Average MPG displayed from fill up to fill up if no stops with shut downs are between (like on a trip) ..... the SGII Average MPG is within a tenth or two of the calculated MPG from the last stop. My speedos are dead on, time is a constant, and this tells me the PCM gives a good read on GPH rate for the SGII to be so close.

Now, it goes without saying, if you stop after 76 miles and eat a meal and then restart you spoil the SGIIs ability to accurately reflect AV MPG for that tank to tank run.

I use the instant MPG above the Av MPG readout to hone my right foot's ability to make bigger MPG numbers. Really makes good habits, much like the old days and my Daddy did with his "Mile-O-Meter" which was a vacume gage with a coded scale.

Something else I play with sometimes is I start the car, get out of the drive way and out to the main road, get up to speed, and then unplug and replug the SGII up and that way I see what she'll do on strictly highway runs without the mileage killing low speed driveway and kill and back road. Just for kicks.
Of course, this returns higher numbers than total use, but it gives a good idea of strictly "highway averages".


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post #213 of 303 (permalink) Old 01-05-2012, 12:10 AM
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Originally Posted by CrystalPistol View Post
I agree.

On my '95 Tbird, '07 FX4, and the '01 Mercury GM ..... after using the SGII since Feb 2010 ..... I find that the Average MPG displayed from fill up to fill up if no stops with shut downs are between (like on a trip) ..... the SGII Av MPG is within a tenth or two of the calculated MPG from the last stop. My speedos are dead on, time is a constant, and this tells me the PCM gives a good read on GPH rate for the SGII to be so close.

Now, it goes without saying, if you stop after 76 miles and eat a meal and then restart you spoil the SGIIs ability to accurately reflect AV MPG for that tank to tank run.

I use the instant MPG above the Av MPG readout to hone my right foot's ability to make bigger MPG numbers. Really makes good habits, much like the old days and my Daddy did with his "Mile-O-Meter" which was a vacume gage with a coded scale.

Something else I play with sometimes is I start the car, get out of the drive way and out to the main road, get up to speed, and then unplug and replug the SGII up and that way I see what she'll do on strictly highway runs without the mileage killing low speed driveway and kill and back road. Just for kicks.
Of course, this returns higher numbers than total use, but it gives a good idea of strictly "highway averages".

Well, my odometer doesn't work, I don't have a scangauge, so I do it the old-fashioned way, I log the mileage with the GPS, then fill the tank again and divide mileage by gallons used. Therefore, my MPG is always the average of the entire tank city/highway/country/idling/racing/whatever.

The GPS makes my numbers VERY accurate. I guess on that 2nd tankful listed above, I did more highway driving since the avg is up.

~Rick
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post #214 of 303 (permalink) Old 01-05-2012, 08:20 AM
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My odo is broken too NetKeym, I do it the same way as you No matter what driving your doing, it always gives you the avg of what you have done for that tank, and therefore is the most accurate way of measuring Avg. MPG imo.

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post #215 of 303 (permalink) Old 01-13-2012, 08:45 PM
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I guess I'll throw mine out there

City: 15-18
Highway:23ish
Combined:21
Grade: 87/89 (Depending on where I am)
No upgrades. Best I ever got was 31.5 MPG while driving through Nebraska heading back from Yellowstone it was like 317.2 miles on 10.07 gallons of gas (89 grade). It made me feel good that a v8 4000 pound car could get such good gas mileage. Average speed on that tank was approximately 75-80 MPH.

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My driving is a constant struggle between wanting good gas mileage and driving like I'm Mario Andretti.

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post #216 of 303 (permalink) Old 01-14-2012, 10:10 AM
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Quote:
Originally Posted by SuperThunderbirdLX View Post
I guess I'll throw mine out there

City: 15-18
Highway:23ish
Combined:21
Grade: 87/89 (Depending on where I am)
No upgrades. Best I ever got was 31.5 MPG while driving through Nebraska heading back from Yellowstone it was like 317.2 miles on 10.07 gallons of gas (89 grade). It made me feel good that a v8 4000 pound car could get such good gas mileage. Average speed on that tank was approximately 75-80 MPH.
What is it about that state that makes for good gas mileage numbers? My best tank was there, coming home (to SD, at the time) from Colorado, and I didn't believe it when I filled up in Valentine and calculated 31-32 MPG.

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post #217 of 303 (permalink) Old 01-14-2012, 10:41 AM
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What is it about that state that makes for good gas mileage numbers? My best tank was there, coming home (to SD, at the time) from Colorado, and I didn't believe it when I filled up in Valentine and calculated 31-32 MPG.
Maybe it's downhill both ways!

Like my dad used to tell me he had to walk a mile uphill both ways to school when he was a kid!

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post #218 of 303 (permalink) Old 01-14-2012, 01:04 PM
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Like my dad used to tell me he had to walk a mile uphill both ways to school when he was a kid!
I literally did.

I walked up the hill from the house to the main drag, over to the school, and down the hill to the school.

Up the hill from the school to the main drag, over to the house, and back down hill.

So, yes, uphill both ways. Took driver's ed there when I was 14, so I had to walk in the hot July sun. And natch, in the winter (one of the winters we had this white stuff all over the place - and no, I don't mean cocaine!)

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post #219 of 303 (permalink) Old 01-14-2012, 02:13 PM
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I literally did.

I walked up the hill from the house to the main drag, over to the school, and down the hill to the school.

Up the hill from the school to the main drag, over to the house, and back down hill.

So, yes, uphill both ways. Took driver's ed there when I was 14, so I had to walk in the hot July sun. And natch, in the winter (one of the winters we had this white stuff all over the place - and no, I don't mean cocaine!)

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Yeh, I took Driver's Ed when I was 14, had my license when I was 15 in Maine. I don't think they do that anymore; I think you have to be 16 to get a license.

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post #220 of 303 (permalink) Old 01-14-2012, 04:23 PM
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My dad had it uphill both ways too; there's a valley between the family farm and the site of the country school.

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post #221 of 303 (permalink) Old 01-29-2012, 03:27 AM
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96 THUNDERBIRD
stock:
13mpg city
14mpg hwy
87 an 89 octane

after head an intake work:
14 mpg city
lite hwy at 14 mpg
I know , I can't get it either
91 octane
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post #222 of 303 (permalink) Old 01-29-2012, 07:22 AM
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Originally Posted by 90 sc 460 View Post
96 THUNDERBIRD
stock:
13mpg city
14mpg hwy
87 an 89 octane

after head an intake work:
14 mpg city
lite hwy at 14 mpg
I know , I can't get it either
91 octane
Those are awful. Do you have any upgrades? Have you seafoamed/tuned up? Maintenance kept up with? Unless you drive like the gas pedal is an on and off switch you should be closer to 18ish on the highway.

I average 18 (on 89) and I do the worst kinda driving.. Car in my Info. I start it up 5 minutes before I leave, drive 6 minutes, then go to school for 8 hours. then drive it home without heating it up.

-Daniel

My driving is a constant struggle between wanting good gas mileage and driving like I'm Mario Andretti.

http://forums.tccoa.com/showthread.php?t=134659&page=4

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post #223 of 303 (permalink) Old 01-29-2012, 09:43 PM
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Quote:
Originally Posted by SuperThunderbirdLX View Post
Quote:
Originally Posted by 90 sc 460 View Post
96 THUNDERBIRD
stock:
13mpg city
14mpg hwy
87 an 89 octane

after head an intake work:
14 mpg city
lite hwy at 14 mpg
I know , I can't get it either
91 octane
Those are awful. Do you have any upgrades? Have you seafoamed/tuned up? Maintenance kept up with? Unless you drive like the gas pedal is an on and off switch you should be closer to 18ish on the highway.

I average 18 (on 89) and I do the worst kinda driving.. Car in my Info. I start it up 5 minutes before I leave, drive 6 minutes, then go to school for 8 hours. then drive it home without heating it up.
I agree! Is that a 96 4.6L Bird? My 95 4.6L literally gets about double what you are getting for mileage!
Please, at the very least, give that car the following:

New Plugs
New Air Filter
New Fuel Filter
New PCV Valve
New Plug Wires
Oil & Filter Change
Tranny Fluid & Filter Change
Repair ALL vacuum leaks (I guarantee you have some).
Seafoam the engine
Check fuel pressure all stored ECM codes - fix as required.

After all that, I know you will be getting much better mileage, an ROI like you wouldn't believe and your expenses will come back to you via fuel cost reduction in no time!

~Rick
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post #224 of 303 (permalink) Old 01-30-2012, 02:43 AM
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I agree! Is that a 96 4.6L Bird? My 95 4.6L literally gets about double what you are getting for mileage!
Please, at the very least, give that car the following:

New Plugs
New Air Filter
New Fuel Filter
New PCV Valve
New Plug Wires
Oil & Filter Change
Tranny Fluid & Filter Change
Repair ALL vacuum leaks (I guarantee you have some).
Seafoam the engine
Check fuel pressure all stored ECM codes - fix as required.

After all that, I know you will be getting much better mileage, an ROI like you wouldn't believe and your expenses will come back to you via fuel cost reduction in no time!
This is more for 90 SC 460. These are in no specific order. If you need an order its prolly gonna be.

Vacuum leaks
Seafoam (Your call, you can go 1/3 of fuel, oil and vacuum. Or go 1/2 fuel and vacuum. If you want more than 1 can, go for it.)
Oil and filter
Tranny fluid and filter change (I'd leave that to a good shop)
{New Plugs
New Air Filter
New Fuel Filter
New PCV Valve
New Plug Wires} All at once!
Then make sure to check the ECM to make sure everything is operating properly.

EDIT: Jeez. I just realized you have a 460 BB. I thought it was just a name. Video's or engine pictures of said car? I guess your gas mileage isn't too bad. But I'd still go through with the tuneup. What tranny do you have bolted onto it?

-Daniel

My driving is a constant struggle between wanting good gas mileage and driving like I'm Mario Andretti.

http://forums.tccoa.com/showthread.php?t=134659&page=4

1997 Pacific Green Thunderbird LX- Stock 201xxx miles Daily Driver

Last edited by SuperThunderbirdLX; 01-30-2012 at 02:56 AM.
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post #225 of 303 (permalink) Old 01-30-2012, 08:20 AM
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This is more for 90 SC 460. These are in no specific order. If you need an order its prolly gonna be.

EDIT: Jeez. I just realized you have a 460 BB. I thought it was just a name. Video's or engine pictures of said car? I guess your gas mileage isn't too bad. But I'd still go through with the tuneup. What tranny do you have bolted onto it?
460? He started his mileage post off with:

Quote:
Originally Posted by 90 sc 460 View Post
96 THUNDERBIRD
stock:

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post #226 of 303 (permalink) Old 01-30-2012, 08:51 AM
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As an update.

Engine: 4.6L
City MPG: 15
Highway MPG: If I had to guess, I'd say probably around 20.6 MPG.
Combined MPG: 17.8
Fuel Used: 87
Average Highway Cruise Speed: 70 mph
Average Climate: about 85 deg. F in summer, 45 in winter
Mods: j-mod, 3.73 TL, PI intake manifold, 87 and 93 tune, under drive pulleys, Dynomax cat back exhaust, 180 degree t-stat and 1 heat range colder spark plugs, plus what ever else is in my sig.
Mileage on the Engine: 133,300
Comments: No vacuum leaks, EGR is disabled. I normally don't carry a whole lot of weight in the car other than my school books and I. I typically do 50% city and 50% hwy.

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Last edited by Mgino96tbird46; 01-30-2012 at 09:01 AM.
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post #227 of 303 (permalink) Old 01-30-2012, 06:35 PM
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460? He started his mileage post off with:
Sorry. I was guessing cause of his info on the left. I second guessed myself and posted to quick, I didn't see the 96 bird part.

-Daniel

My driving is a constant struggle between wanting good gas mileage and driving like I'm Mario Andretti.

http://forums.tccoa.com/showthread.php?t=134659&page=4

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post #228 of 303 (permalink) Old 01-30-2012, 07:02 PM
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Sorry. I was guessing cause of his info on the left. I second guessed myself and posted to quick, I didn't see the 96 bird part.
I knew what you did; I do that stuff all the time! No biggie!

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post #229 of 303 (permalink) Old 01-30-2012, 07:31 PM
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Just thinking about it I got 31.5MPG with 2 or more vacuum leaks. CEL on and everything, I wonder if I lost a MPG or 2 having the leaks?

-Daniel

My driving is a constant struggle between wanting good gas mileage and driving like I'm Mario Andretti.

http://forums.tccoa.com/showthread.php?t=134659&page=4

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post #230 of 303 (permalink) Old 01-30-2012, 07:33 PM
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Just thinking about it I got 31.5MPG with 2 or more vacuum leaks. CEL on and everything, I wonder if I lost a MPG or 2 having the leaks?

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post #231 of 303 (permalink) Old 01-30-2012, 07:42 PM
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http://i1006.photobucket.com/albums/af185/dickbragg/Junk/bsflag.gif
True story. I don't know how I can prove it now. but I swear. It was in nebraska as I stated in a previous post. Drafted off Semis and my dads truck that had a trailer hooked up. Cruise at 78 all the way. Only stopped to fill up.

-Daniel

My driving is a constant struggle between wanting good gas mileage and driving like I'm Mario Andretti.

http://forums.tccoa.com/showthread.php?t=134659&page=4

1997 Pacific Green Thunderbird LX- Stock 201xxx miles Daily Driver
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post #232 of 303 (permalink) Old 01-30-2012, 08:13 PM
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post #233 of 303 (permalink) Old 01-30-2012, 08:18 PM
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Yeah... managed high 29 once, low 29 once, then the rest were all 27 or under. Most recently 24-25, then after 3.73s 22ish at best.

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post #234 of 303 (permalink) Old 01-30-2012, 08:18 PM
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I was getting 28's and 29's the whole trip depending on who was driving. The 31.5 just happened to be my high. The additives in some gases can mess with fuel economy too. ptschett also claims he had outstanding gas mileage in Nebraska.

-Daniel

My driving is a constant struggle between wanting good gas mileage and driving like I'm Mario Andretti.

http://forums.tccoa.com/showthread.php?t=134659&page=4

1997 Pacific Green Thunderbird LX- Stock 201xxx miles Daily Driver
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post #235 of 303 (permalink) Old 01-30-2012, 09:57 PM
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I've deleted my original post, here's my current set up.

97 Thunderbird
Engine: Modified 4.6 DOHC
City MPG: 13.3-17.1
Highway MPG: 18.2-24.4
Typical mixed mileage: 14.2-16.0, I like to drive the wheels off of it on my days off.
Fuel Used: 91 Octane, Usually from Chevron, Shell, and on rare occasion ARCO (BP)
Average highway speed: 65 - 85.
Average Climate: Hot, Hot, 2 weeks of nice, Cold, 2 weeks of nice, Hot, Hot, repeat
Mechanical Mods: All listed in my 97 Alpine green photo gallery
http://forums.tccoa.com/vbpicgallery.php?do=view&g=144
Milage on the engine: approx 2500 currently.
Milage on chassis:140,500 miles
Rear axle: 8.8 trac-lok 3.27
Average commute: 44 miles round trip for work each day, 4 days a week.
Comments: Not bad, I've considered stepping up to 3.73's though I'm not sure I'll be able to afford driving it around just for fun on my days off if I step up. All mpg calculated for me via scan gauge 2.

-1996 Pearl White Thunderbird 4.6 Sport 4v with many mods:
Current Best: 13.583 @ 103.74 10/2014.
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Amber_Murder's Daily Driver.
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post #236 of 303 (permalink) Old 02-02-2012, 10:33 AM
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Engine: 4.6 L
City MPG: 17
Highway MPG: 23
Fuel Used: 87 Octane
Average highway speed: 72
Average Climate: Moderate Winter Hot and Humid summers
Mechanical Mods: Stock
Mileage on the engine: 170k
Comments: Most driving is around town and road trips usually are only a few hours one way.
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post #237 of 303 (permalink) Old 02-02-2012, 03:25 PM
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I'm curious. Does 20 mpg sound about right with no EGR and having 3.73's?

Michael M. ASE P2 Automobile Parts Specialist.

1996 Thunderbird LX. Gone, but not forgotten Oct 1995-March 24 2016

1985 Mustang GT. modified stock Holley 4180C, Weiand Street Warrior intake manifold, equal length headers, true dual exhaust, 5 speed, 3.55:1 8.8'' rear end, Ford Racing 10.5" clutch.

1998 Mustang GT premium. Auto, stock, and slow. Daily beater.
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post #238 of 303 (permalink) Old 02-02-2012, 03:28 PM
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Probably a little high. When my car was still N/A with 3.73s and functioning EGR, it would knock down 19 mpg highway. Now that is is S/C with 4.10s and no EGR, it gets about 10-12 mpg!

MikeB
1997 Thunderbird Sport
5.0L-2V NPI S/C
375 RWHP / 416 RWTQ
11.959 @ 117.17 MPH
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post #239 of 303 (permalink) Old 02-16-2012, 05:57 PM
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Originally Posted by Mgino96tbird46 View Post
I'm curious. Does 20 mpg sound about right with no EGR and having 3.73's?
Sounds fair. I get 22-24ish with EGR, depending on cruising speed. City is usually 20, give or take an MPG.

-Brandon
97 Laser Red Thunderbird LX 155k, Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58 | Build details | Pics at the Lorain Assembly plant
96 Ivory Mark VIII 233k, stock 4.6 32v on coils; New engine at 185k
Gone but not forgotten: 94 Cougar XR7, 93 Mark VIII

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theterminator93 is offline  
post #240 of 303 (permalink) Old 02-16-2012, 05:58 PM
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Join Date: Jan 2012
Location: Michigan
Posts: 12
1994 Cougar v-8 all stock as far as I know with under 60k miles

city mpg:17
highway mpg:21 at 70mph
average:18-19 mpg

I usually drive slow and easy, so why is the mileage so low? The air filter is ok. The idle seems ok. The copper Motorcraft plugs look good. The fluids seem ok as well.
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