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Mod | | | Forums66 Topics128,143 Posts1,056,495 Members48,442 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: May 2005 Posts: 281 'Bolter | | 'Bolter Joined: May 2005 Posts: 281 | I have been trying to make adjustments to my engine to improve gas mileage, but with minimal success. The most recent road trip was 750 miles with about 2/3 interstate and the rest mostly good 2-lane highway. Overall on the trip was a shade under 15 mpg. I run about 75-80 on the interstate and 65-70 on 2-lanes generally with the AC. Engine is a 350 with iron vortec heads and a quadrajet. Transmission is a 700R4 with 3.73 rear gear. Likely a pretty common setup. The rpm is about 2600 at 80 mph. I'm curious if 15 is about what most of you get with a similar combination. If so, I will quit messing with jets, timing, distributor curves, etc and just go with it. Thanks for any comments.
Mark | | |
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