Fuel efficiency...what MPG do you get? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gchemist · 03-26-2008, 04:35 AM

Last time I posted BS started walking because some people don't think it's possible.

old stock 305 - 18 MPG at 70 MPG. Drove straight though the tanks too. Long 1000 mile trips.
305 - 13 MPG in the city. Lots of work on engine and truck.

ZZ4 - 13 MPG in the city so far. I can't seem to keep my foot out of it. 2500 stall and higher than normal shift points until the tranny is well broken in. I can't wait for a long trip out of town. I'm really curious on what it can pull off. Planning a trip in May. I'll drive through full tanks and calculate.

03-26-2008, 04:35 AM	#11
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: Fuel efficiency...what MPG do you get? Last time I posted BS started walking because some people don't think it's possible. old stock 305 - 18 MPG at 70 MPG. Drove straight though the tanks too. Long 1000 mile trips. 305 - 13 MPG in the city. Lots of work on engine and truck. ZZ4 - 13 MPG in the city so far. I can't seem to keep my foot out of it. 2500 stall and higher than normal shift points until the tranny is well broken in. I can't wait for a long trip out of town. I'm really curious on what it can pull off. Planning a trip in May. I'll drive through full tanks and calculate. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

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