Thread: What kind of gas mileage do you get with your 67-72?
View Single Post
Old 10-05-2018, 02:04 AM   #45
71CHEVYSHORTBED402
Senior Member
 
71CHEVYSHORTBED402's Avatar
 
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,126
Re: What kind of gas mileage do you get with your 67-72?
Quote:
Originally Posted by ZEKE68 View Post
250 Straight Six one barrel with a powerglide and 3.73, got 10 mpg
250 Straight Six four barrel with a powerglide and 3.73, got 9.75 mpg
454 Big Block with two fours and a 4L80E and 3.73 rear, get 9.75 mpg which seems like a bargain!
Yep. I've always heard it doesn't much matter what stock engine is under the hood, there's going to be little difference in MPG. Less 4WD applications, I believe the real difference is longevity. The smaller the block the longer span between rebuilds.

But tough to see past the look and feel of a BBC.
__________________
Tony
71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring it from ground up. With assys, the guide accts for 1000s of OEM identifications and part numbers, all written in short order. 700+ images include assm, illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025
71CHEVYSHORTBED402 is offline   Reply With Quote