What the deal with the gas mileage? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Boog** · 06-05-2005, 10:01 PM

K72516. As evidenced by my 88 GMC 305, 700R4 and 2.73 gears, there are a lot of trucks leaving the factories with a less than perfect combination of components. Looking at the numbers you might think my short should get real good mileage but 15 city/ 16.5 highway is the best it will do. The 305 needs to be turning more rpms to get better mileage. The 350's, most always, get better mileage. Some exceptions of course. 4 wheel drives and great fuel mileage don't go together.

06-05-2005, 10:01 PM	#26
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,700	K72516. As evidenced by my 88 GMC 305, 700R4 and 2.73 gears, there are a lot of trucks leaving the factories with a less than perfect combination of components. Looking at the numbers you might think my short should get real good mileage but 15 city/ 16.5 highway is the best it will do. The 305 needs to be turning more rpms to get better mileage. The 350's, most always, get better mileage. Some exceptions of course. 4 wheel drives and great fuel mileage don't go together. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross



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