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post #1 of 22 (permalink) Old 01-19-2005, 07:28 AM Thread Starter
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An Exercise In Fuel Economy

I'm probably going to start driving my Cougar (4.6L) to and from work (55 miles each way) and I've been "thinking" about something.

Everyone (myself included) usually goes for the performance over fuel economy route. Well I'm thinking about going fuel economy over performance.

Here is my "plan" and my "goal":

Goal:
35 to 40 mpg highway and 15.0 - 15.9 1/4 mile times

Plan:
2.73 Traction Lock
Good "Fuel Economy" Tune (Probably from Lonnie)(Must be coded to run on 87 octane)
Modified TC lockup schedules and shifting routines (what I'm thinking is let the transmission shift more to handle the low gear set)
U/D Pulleys
Leave the exhaust as is (all 3 cats and just "resonator tips") to keep the bottom end torque

I've seen people getting 27/28 (My best was 28.5 in my T'Bird when it was stock and had 3.08's) so I'm figuring that 30 - 35 should be "doable" if I keep my foot out of the throttle (which will probably be the hardest part )

So does anyone have any other thoughts (excluding narrower tires... I'm set on the 235 60 16's that I have on there now).

97 Lincoln Mark VIII LSC (Chip'd, 3.73 T/L... so far... )
97 Ford Aspire (Slow, but getting 36 mpg (f'n Ethenol!! )
84 F250 Dually w/6.9L Diesel (7.3L IDI pending)
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post #2 of 22 (permalink) Old 01-19-2005, 08:49 AM
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Thinking about wind resistance..........................

Are you lowered already? That will make your frontal profile smaller, and give you a little less resistance. Maybe a front air dam to keep more air out from under the car.

Keep your windows up, don't run the A/C.

Change all the oils to full synthetic, including differential.

Old cars used to have an overdrive that let the car 'freewheel' when you let off the gas. If the TC wasn't locked at highway speeds, would you get that effect? or at least if it unlocked when you took your foot off the gas? I know my Expedition does that, and I HATE it, waiting for it to lock backup after you step on the gas again.

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post #3 of 22 (permalink) Old 01-19-2005, 11:14 AM
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no chance getting anywhere near 40mpg in any tbird, i don't care what you do to it.

Best I ever got was 30.5 on a freeway to carlisle doing about 75-80mph with 3.08 open gears. An open rear is going to give you better gas mileage than a trac loc would.
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post #4 of 22 (permalink) Old 01-20-2005, 06:40 AM Thread Starter
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Quote:
Originally Posted by JustinH
No chance getting anywhere near 40mpg in any tbird, i don't care what you do to it.

Best I ever got was 30.5 on a freeway to Carlisle doing about 75-80mph with 3.08 open gears. An open rear is going to give you better gas mileage than a trac loc would.
Well, I did say 35 to 40... j/k

Here's my logic:
1. Keep my foot out of the throttle (I can change the mpg by +- 5, just by driving style)
2. 2.73's might be good for 1 - 2 mpg depending on how hilly the terrain is
3. A good tune nets 2 mpg from what everyone says (and what I've observed with both my chips)(And maybe if the tune is done with fuel economy in mind, then it might even net more)
4. Full synthetics might net me 1 mpg.

And yeah, 40 will be VERY tough to touch! But I think 35 is possible. (Oh and I am ONLY talking about 100% highway driving... )

And right now with the 3.73's in my T'Bird I'm getting about 20 mpg. So even if I can add 10 mpg in the Cougar, I'll still be noticeably reducing my monthly fuel bill.

97 Lincoln Mark VIII LSC (Chip'd, 3.73 T/L... so far... )
97 Ford Aspire (Slow, but getting 36 mpg (f'n Ethenol!! )
84 F250 Dually w/6.9L Diesel (7.3L IDI pending)
73 Mercury Cougar Convertible w/351C 4V (Partially Restored)
69 F100 LWB w/460 Engine
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post #5 of 22 (permalink) Old 01-20-2005, 07:05 AM
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You would blow my mind if you got 35mpg in a v8 rwd 4000 pound coupe.

JH
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post #6 of 22 (permalink) Old 01-20-2005, 07:15 AM
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post #7 of 22 (permalink) Old 01-20-2005, 07:24 AM
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don't forget to remove the interior, and scrape all the insulation off, you are going to need every pound in weight savings.

Forget bringing any luggage also

Just kidding dude I'm eager to see the results.
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post #8 of 22 (permalink) Old 01-20-2005, 08:15 AM
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I got 35mpg on the way to 2002 MN12Nationals. 3.08 open and 205mm wide tires and this was going both up and down the Blue Ridge Mountains. And none of the lowering crap either.

R.I.P. Joel Bender 07/30/79 - 03/26/06
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post #9 of 22 (permalink) Old 01-20-2005, 11:08 PM
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damn, I need to get a 4.6 for mileage. Even bone stock I never seen better than 26 out of my 3.8L, worst was 22mpg stock. Now with the blower and 3.73's I see ~23highway, ~18 back and forth to work.

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post #10 of 22 (permalink) Old 01-20-2005, 11:15 PM
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Must just be the way I drive or something, but I get 18 out of my car (city, 22-25 highway) bone stock.

"Won't work, can't be done"
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post #11 of 22 (permalink) Old 01-21-2005, 06:46 AM Thread Starter
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Every 4.6L that I own (T'Bird (SOHC) w/3.73’s, Cougar (SOHC) w/3.08’s, and Mark VIII (DOHC) w/ 3.27’s), I can change the mpg by AT LEAST 5 mpg just by the way I drive. These 4.6L's love to inhale gas at WOT... especially with a stock tune.

97 Lincoln Mark VIII LSC (Chip'd, 3.73 T/L... so far... )
97 Ford Aspire (Slow, but getting 36 mpg (f'n Ethenol!! )
84 F250 Dually w/6.9L Diesel (7.3L IDI pending)
73 Mercury Cougar Convertible w/351C 4V (Partially Restored)
69 F100 LWB w/460 Engine
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post #12 of 22 (permalink) Old 01-21-2005, 07:40 AM
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R.I.P. Joel Bender 07/30/79 - 03/26/06
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1997 Thunderbird LX 4.6 AED 349.27RWHP/391.29RWTQ Engine Build Exterior shots
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post #13 of 22 (permalink) Old 01-22-2005, 04:59 AM
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Quote:
Originally Posted by 94 Daily Driven 4.6L
.....And maybe if the tune is done with fuel economy in mind, then it might even net more
i think a good tune will net you even more......on the 550-some miles to my dyno tune i got about 21.5 mpg, and on the way home i got 25.x mpg........i read that Lonnie has a very good economy tune...... in fact, so good, that he doesnt give out specifics to anyone....so it must be good!
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post #14 of 22 (permalink) Old 01-22-2005, 09:35 PM
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how about fiberglass hood, doors and trunk
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post #15 of 22 (permalink) Old 01-23-2005, 02:19 AM
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Get behind an 18 wheeler, and draft him like you mean it!!
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post #16 of 22 (permalink) Old 01-24-2005, 11:40 PM
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Quote:
Originally Posted by the89bird
Get behind an 18 wheeler, and draft him like you mean it!!
and pray one of the rear tires don't blow out and have part of it land on your windshield at 60-some mph
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post #17 of 22 (permalink) Old 01-25-2005, 03:37 PM
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Quote:
Originally Posted by guitar maestro
and pray one of the rear tires don't blow out and have part of it land on your windshield at 60-some mph
If it is gonna blow, you better be back some distance anyhow, so I say, THERE SHE BLOWS!!
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post #18 of 22 (permalink) Old 01-25-2005, 06:13 PM
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Weight is not so much an issue once you are at speed and on the highway you anit stopping much.
You may also want to try and play with the spoiler.
I'd say 35 is do able I've gotten 27mpg in mine with Cruise set at 75mph between Memphis and Jackson. Though I normally see 16-18 in town and 22 highway.
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post #19 of 22 (permalink) Old 01-25-2005, 07:05 PM
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Take the spoiler off if there is one. SCCoA guys tested it and got better MPG with it off.

R.I.P. Joel Bender 07/30/79 - 03/26/06
R.I.P. Johnny Langton 1975-2011

1997 Thunderbird LX 4.6 AED 349.27RWHP/391.29RWTQ Engine Build Exterior shots
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post #20 of 22 (permalink) Old 01-25-2005, 07:36 PM
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Makes sense too much down force is too much friction.
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post #21 of 22 (permalink) Old 01-25-2005, 07:46 PM
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Oh wait, that's a cougar, might not make too much of a difference. The Birds are so aerodynamic it disrupts the smooth flow from the rear window. With a Cougar though they've already got a pocket of negative pressure air behind the rear window. I guess someone with a cougar can test it to see what the results are.

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post #22 of 22 (permalink) Old 01-25-2005, 08:00 PM
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[Plan:
2.73 Traction Lock
Good "Fuel Economy" Tune (Probably from Lonnie)(Must be coded to run on 87 octane)
Modified TC lockup schedules and shifting routines (what I'm thinking is let the transmission shift more to handle the low gear set)
U/D Pulleys
[/QUOTE]

The idea of improving the gas milage is nice. The only point I would bring up is ..WHY? If it is to save mony on the 55 mile trips, How many miles would you have to go to save enough money on gas to pay for the mods? It my be cheaper in the long run to leave it as is.

Just food for thought.

Chris Sr.

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When you get tired of keeping up with the Jones, It's time to start keeping up with your dreams!
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