What drivetrain would you put in for 30 mpg?

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If you wanna go crazy:
-OD trans
-Monte SS nose
----headlight covers
-tonneau cover for the bed
-aluminum wheels
-fiberglass hood
-Aluminum LS swap
-good exhaust
-high quality wheel bearings
-hope for the best

Like others have mentioned, the car itself is working against MPG.
 
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You want 30 mpg in a G-Body put a modern diesel in it. Maybe even with a turbo.
 
For max mpgs out of a g body, best to start with an aerocoupe Monte. Add a front airdam to keep air from going under the car.
 
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www.wired.com/2009/09/electro-camino/amp/

1 cent per mile..... for this car.


Even if you got 30 mpg that would be roughly 8 cents per mile at current fuel prices.

This Camino is the antithesis of everything we love about G bodies, IMO. 30K to build, and a daily range of 130 miles...wow, can't believe these aren't everywhere :puke:
 
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I cant see 30 mpg in a gbody. Its just too boxy and heavy in stop and go. Sure my buddies 3rd gen "spare parts" Fbody pulls down mid to high 20's with an ez-efi, alum headed sbc and tko 6 speed. But he drives like a granny and doesn't like to rev it over 2k he's so miserly. Hell the price of his trans alone ( nevermind the efi, ect... ) would pick you up a rice burner that will pull 30-35 mpg with the A\C on.
Miserly is what is required for that type of economy.
 
Super Chevy (more specifically Doug Marion) achieved MPG in the high 20s (best of 29, if I recall correctly) way back in the late 70s/early 80s in a big 'ol first gen Monte Carlo. Project Econo Performer. Imagine how many advances have been made in economy methodology in the intervening 35 years.
 
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Friend of mine and his dad built a 79ish grand prix back in the late 90's with a 403, 2004r, and 2.14 rear and he said it did upper 20's.

My turbo 3.8 drawthrough cutlass with 3.42 and 2004r and gets 22-23 at 73mph ish average. Its still a carb though.

Getting to 30 is tough.

It would HAVE to be efi, and probably 4 or 6cyl manual.

I think a 3800 V6, t5, and 2.41's or less could do it. Some 205 or so skinny tires, and gingerly driving might do it. Problem there is a 3800 is all cast iron and pretty heavy.

For the unlimited budget option a direct injected new 4.3 (basically the lt1 series 5.3/6.2 but v6) with a t5/t56 (maybe even the 8 speed auto or whatever) would do it. New trans programming is so efficient that it might not be that beneficial with a manual. That setup should do it. They get 22 in a truck that weighs 5000+lbs so a 3000lb g body with much smaller area and some tuning, strategic removal of governmental emisions controls and stuff would help.

Other option is an ecotec but they had a specific bellhousing and the only trans that works is out of a solstice/sky for RWD.

Other option would be an atlas series I4/I5 out of a colorado.
 
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