Official 4.6L MPG thread - Page 4 - TCCoA Forums

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post #91 of 303 (permalink) Old 01-30-2008, 11:42 PM
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Originally Posted by The Great Obucina View Post
dont do it.

you dont need a gas receipt, tank is 17 gallons, just press the trip meter button and do some math.
lol don't do it? ummm... why?

and the 17gallon thing works only if u run your tank dry.
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post #92 of 303 (permalink) Old 01-31-2008, 12:06 AM
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I have an 18 gallon tank in my car from a 92 T-bird.

I ran it way below E just to see how low it would go and when I finally stopped to fill up it took 17.93 gallons. Was I cutting it close or what!

I've come into this world with nothing and still manage to have some of it left.

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post #93 of 303 (permalink) Old 02-20-2008, 12:23 AM
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i have have an automatic, does manually downshifting affect gas mileage in any way?
might have answered my own question. i got 12mpg on my last tank. compared to about 18-20 when i wasnt manually shifting at all. i was late to work quite a bit but wow that is out of control.
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post #94 of 303 (permalink) Old 03-03-2008, 08:20 PM
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Engine:4.6 SOHC
City MPG:17
Highway MPG:21
Fuel Used:89 oct
Average highway speed: 60
Average Climate: NE
Mechanical Mods: stock
mileage on the engine: 128000

Comments: good mileage but i can only get 10 or 11 gallons in my 19 gallon tank when its empty.... so either my gauge or pump is bad... or i got a few pounds of Mary Jane in my tank ill be dropping it this summer to find out.
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post #95 of 303 (permalink) Old 03-03-2008, 08:27 PM
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if you are going to drop the tank might as well put a 255lph pump in there

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post #96 of 303 (permalink) Old 03-25-2008, 01:34 PM
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Engine: 4.6 SOHC
Average MPG: 15-17
90k miles
fuel used : 87 octane
Mechanical Mods: removed air silencer, K&N panel filter, exhaust
driven all year long from 20-85 degrees

Straight pipes with 3 inch long tips chrome.---3 cats intact---K&N filter panel---air silencer removed---Eibach 1" lowering spring---Tokico shocks--- slotted rotors--- smoked out rear and front lights---4 way pioneer speakers (260w each) added 2 tweeters and 1200w subs 2 12inch duals with soundstream amp---all rear seats were done black
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post #97 of 303 (permalink) Old 04-16-2008, 03:38 AM
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Engine: 4.6L
City MPG: 15-18
Highway MPG: 23+
Fuel Used: 89
Average highway cruise speed: 80-85MPH (speedo is not accurate, however)
Average Climate: SoCal... dry, can get hot during day, cool at night
Mechanical Mods: K&N cone filter installed into cool intake slot, 225/60R-15 tires
Milage on the engine: 102,000Miles
Comments: new ball joints and new tires made a major difference! if i slowed down on the streets and freeways, i'm sure i could do better!
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post #98 of 303 (permalink) Old 04-16-2008, 12:20 PM
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Engine: 4.6L
City MPG: Unknown
Highway MPG: ~22
Combined MPG: ~15
Fuel Used: 93, usually from Citgo
Average Highway Cruise Speed: 70-75
Average Climate: Long Island weather - warm, mild humidity.
Mods: None.
Mileage on the Engine: 84,000
Comments: I kept track of how much gas I used over one summer and how many miles I drove and the average came out to be 15.07, I think. As of now, I get roughly 240 miles per tank before the warning light comes on. I've had a consistent CEL since I got the car in 2005, and as soon as I get something fixed, something else screws up. The current culprit is P0171/P0174. Cleaned the MAF, no dice. I haven't had the chance to look further into it, but I will when I go back home.

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post #99 of 303 (permalink) Old 04-16-2008, 01:39 PM
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I fine this hard to belive myself. Just got back with the bird on a road trip. Checked mileage 153 miles on 5 gallons = 30.6 !! This was flat ground cruise . 273 miles on 10 gallons =27.3 this was hills coming up I-81 in VA. How in the world ??? I still cant belive that. It was a steady cruise trip 75 MPH 2300 or so RPMs

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post #100 of 303 (permalink) Old 04-16-2008, 01:47 PM
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I just went on a 234.5 mile trip Sunday and Monday morning I put 11.132 gallons of 87 octane in that is just over 20 mpg. I averaged between 75-95 ans gunning it out of the tolls to get in the right lane I needed. That does not seem too bad to me with a V8 and driving the way I did.

1995 LX 4.6 Stock for now.
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post #101 of 303 (permalink) Old 04-16-2008, 01:52 PM
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Yep jeremy yours seams to be on the right track for 20 or so . mine was a 1k round trip and I put in 92 to 93 the hole way.

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post #102 of 303 (permalink) Old 04-16-2008, 02:18 PM
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I have a 4 cylinder Cavalier for my daily driver and at 55-60 I can only get 30-31 mpg I usually do between 75-90 and get only 25-27 with that. I will have to double check next time I fill it up.

1995 LX 4.6 Stock for now.
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post #103 of 303 (permalink) Old 04-17-2008, 12:25 PM
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well I just got back from a trip to Tacoma/seattle. first the car

96 Tbird
2002 4.6L With 01 Bullitt Intake
90mm Lightning Maf, Dynomax Cat Back exhaust, PI 3500 Triple Torque Converter, Dynotech Drive Shaft, EGR shut off
Engine has about 45k on it now
3.73 Cobra Rear End

On the way there I drove about 73-80 the whole way there except one stretch where it was completely flat and open And I went ahead and gunned it and cruised at 130+ (GPS) and after I got to tacoma I went and filled her up and avg a 21.233 MPG

On the way back it was colder but decided to set 140 in the GPS max speed plus I had to do a little city driving to find some dinner and a bathroom so that one avged about 22.5 MPG I think I could 27-28 out of her if I had EGR turned back on.

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post #104 of 303 (permalink) Old 04-17-2008, 12:58 PM
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Quote:
Originally Posted by ThunderChecken View Post
I fine this hard to belive myself. Just got back with the bird on a road trip. Checked mileage 153 miles on 5 gallons = 30.6 !! This was flat ground cruise . 273 miles on 10 gallons =27.3 this was hills coming up I-81 in VA. How in the world ??? I still cant belive that. It was a steady cruise trip 75 MPH 2300 or so RPMs
Yeah, the 4.6 is awesome on the highway that way.

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post #105 of 303 (permalink) Old 04-17-2008, 01:06 PM
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Wow Mike I have never heard of a V8 in our birds getting that. Jezz I sure was surprized to fine that math tells it like it is

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post #106 of 303 (permalink) Old 04-17-2008, 01:15 PM
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Must have had a nice tail wind along the way.

BTW, It's my last day at work here and I'm screwing off on the company computer on company time!!!

Mods? Yea, I got mods ...
Air silencer delete, warp drive, dilithium crystals, flux capacitor, Slingshot Rubber band power adder, Moonshine & Gas, Leaf Blower Supercharger, Hamster Wheel & Hamster, Energizer Bunny generating 1.21 gigawatts, Mr. Fusion® Home Energy Reactor, hover conversion and a sextant celestial navigation system (The original GPS)
Best 1/4: 1,320 nanoseconds @ 670,616,629.2 miles per hour

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post #107 of 303 (permalink) Old 04-17-2008, 01:17 PM
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post #108 of 303 (permalink) Old 05-03-2008, 12:15 PM
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Engine: 4.6L SOHC
City MPG: 18
Highway MPG: 26
Fuel Used: 87/89
Average highway speed: 70-75mph
Average Climate: winter 20's, summer 80-90
Mechanical Mods: PI Intake
Mileage on the engine: 233K
Notes: High Flow cats, cold air intake

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post #109 of 303 (permalink) Old 05-03-2008, 12:43 PM
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never heard of that kind of mileage? Dude my Tbird averaged about 32MPG going to TN. Did 2K RPM the whole way there. Windows cracked A/C off. V8's are very effecient while cruising. Thats just the way they are.

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post #110 of 303 (permalink) Old 05-05-2008, 05:35 PM
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yeh but if you work in the city boy o boy gonna cost ya, but I can say around 30 mpg with the v8 is very plausible
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post #111 of 303 (permalink) Old 06-02-2008, 06:45 PM
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Engine: 4.6L
City MPG: 19
Highway MPG: 23+
Average highway speed: Yup, set the Cruise for MPG, 55 mph- unless I'm intermittently 'in the radiator'...
Average Climate: Long Island-30s to 90s
Mechanical Mods: None
Milage on the engine: 90k
Comments: this is based on spec after the K&N Panel but BEFORE air delete and MAF cleaning... I'll see if it improves or not an update accordingly...
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post #112 of 303 (permalink) Old 06-22-2008, 10:09 PM
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Combined mpg is right at 26. Thats a mix of city/highway,and a/c and non-a/c. I drive 82 miles round trip to work daily, and check the mileage often.
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post #113 of 303 (permalink) Old 06-25-2008, 09:42 AM
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Originally Posted by alicks View Post
Engine: 4.6L
City MPG: Unknown
Highway MPG: ~22
Combined MPG: ~15
Fuel Used: 93, usually from Citgo
Average Highway Cruise Speed: 70-75
Average Climate: Long Island weather - warm, mild humidity.
Mods: None.
Mileage on the Engine: 84,000
Comments: I kept track of how much gas I used over one summer and how many miles I drove and the average came out to be 15.07, I think. As of now, I get roughly 240 miles per tank before the warning light comes on. I've had a consistent CEL since I got the car in 2005, and as soon as I get something fixed, something else screws up. The current culprit is P0171/P0174. Cleaned the MAF, no dice. I haven't had the chance to look further into it, but I will when I go back home.
Update!

For my last two tanks, I used 89 octane.

Tank 1 averaged out to be 14.68 miles per gallon. Although this was with nearly bald and poorly inflated (see ~15 psi) tires.

For tank 2, I replaced the tires, but I had an issue with a misfiring cylinder. MPG for this tank turned out to be 14.72.

I do mostly around town driving, a little highway, but not much. I don't thrash on the car at all, so why my average gas mileage is so horrendous is beyond me.

- Alex B.
Ranger Up - Not everyone's war stories end in high school.

Out of the Thunderbird game for now.
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post #114 of 303 (permalink) Old 06-25-2008, 11:54 AM
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i'd say its probably the fact that one or more of your cylinders is misfiring and you have a broken torque converter.....that kind of deductive reasoning is not beyond me...lol
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post #115 of 303 (permalink) Old 06-25-2008, 12:01 PM
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i'd say its probably the fact that one or more of your cylinders is misfiring and you have a broken torque converter.....that kind of deductive reasoning is not beyond me...lol
No no, I replaced the plugs/wires, that cleared up the misfire issue. And the TC isn't broken, it's just some minor shudder. Or moderate shudder, whatever.

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post #116 of 303 (permalink) Old 06-25-2008, 12:54 PM
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well if it's shuddering then it could be slipping a little and you wouldnt know it.....you'd have to datalog the actual TC slip straight from the EEC with an Xcal2 or similar...just sayin, it could be an issue
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post #117 of 303 (permalink) Old 06-25-2008, 01:07 PM
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Oh no, I don't doubt that the TC is an issue, I fully believe it is. It's just not quite broken yet.

And I only limped around with a misfiring cylinder (#4, if it matters) for ~10 miles. So that second tank was a full tank, mixed highway/city, that got me a grand total of 14.72 mpg. Would a misfiring cylinder, even if only driven for 10 or so miles, or a shudder-y TC, really hurt fuel economy that badly?

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post #118 of 303 (permalink) Old 06-25-2008, 01:12 PM
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probably not the misfiring cylinder if it was only for 10miles, but a shuddery TC all the time is very detrimental to fuel economy
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post #119 of 303 (permalink) Old 06-25-2008, 01:36 PM
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probably not the misfiring cylinder if it was only for 10miles, but a shuddery TC all the time is very detrimental to fuel economy
Well, that sucks. Mercon V flush and J-mod are in order, for sure. I didn't realize it would hit my fuel economy that badly. Hopefully I don't have to replace the TC yet.

- Alex B.
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post #120 of 303 (permalink) Old 07-05-2008, 03:59 AM
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Engine: 4.6L
City MPG: 18
Highway MPG: 25
Combined MPG: 22
Fuel Used: 87 or 91 octane, depending on tune
Average Highway Cruise Speed: 75 MPH
Average Climate: 20* - 115* F, dry
Mods: See Sig
Mileage on the Engine: 1,500
Comments: Looking to get more highway MPG once I get the SCT PRP

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