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Re: Cummin 12 valve Square Body Suburban MPG?
The 80’s gm diesels were made to be fuel misers so they always get the best mpg. My 5.7 consistently got 22-23 mpg at 65/70. Any faster than that and it dropped down to 18/19. Just can’t pull anything serious. My buddies 6bt in a 4x4 dodge got 16mpg all day long. I used to drive a 7.3 for a short minute and it got 13-14mpg loaded or empty.
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