The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1967 GMC V6

**WorkinLonghorn** · 07-03-2019, 07:37 PM

With the camper? No way. With a fresh rebuilt 350 V8 empty on the freeway I get 15 MPG holding 60 steady. Most people on here talk about driving 75+ MPH and wondering why their RPMs are so high and their mileage so poor. Personally I don't think these old trucks are anywhere near safe over 55, but that's another discussion.

There are guys on here with the 351E that can give you real info. -BA

Edit: Oh, that is with 3.73-1 rear and 31" tires ~2500 RPM @ 60MPH. What rear axle do you have?

07-03-2019, 07:37 PM	#10
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,887	Re: 1967 GMC V6 - 351E on a Camper Cruiser With the camper? No way. With a fresh rebuilt 350 V8 empty on the freeway I get 15 MPG holding 60 steady. Most people on here talk about driving 75+ MPH and wondering why their RPMs are so high and their mileage so poor. Personally I don't think these old trucks are anywhere near safe over 55, but that's another discussion. There are guys on here with the 351E that can give you real info. -BA Edit: Oh, that is with 3.73-1 rear and 31" tires ~2500 RPM @ 60MPH. What rear axle do you have? __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme.