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Re: 89 GMC Cummins conversion
Quote:
Originally Posted by 72MARIO
Any updates i am curious how everything is holding up ? How about the mpg any better ?
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So today I took the red truck for a little drive and put about 140 miles on her. I checked the mileage and it was 12.5 mpg, but that includes a lot of idling and short trips while tweaking the transmission tune. On my trip today most of the driving was at 75-80 mph. I'm sure the mileage will go up some after I fix the problem with the 3rd to 4th gear shift. I have to say that I got a lot of thumbs up from drivers in the two little towns that I went through. 
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1987 GMC R2500 SC 454 T400
1988 Chevy R30 CC DRW 12 valve Cummins NV4500 GearVendors
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