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Old 08-10-2019, 01:45 AM   #16
AcampoDave
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Join Date: Feb 2013
Location: central California
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Re: Calculating Mpg.

I was expecting you'd get 12 to 15 depending on road conditions, traffic, etc. For a little perspective, i drive a 2018 Silverado WT extendeded cab with a v/6, a 6 speed A/T and active cylinder management . (Fancy term for going into V/4 mode when coasting or under light throttle cruising). I use it on a weekly service route and routinely haul a few hundred pounds of stuff. The route is part hwy and part city and the mileage, as read by the computer, has been stuck at 19.9 for a long time. Using E85 however, will cause it to fall to the low 17's. I don't have a lead foot or drive aggressively either. My point is that if a modern full size rig can only knock down 20MPG combined, it's kind of a reality check about the potential for a 50+ year old truck. I would gues that getting your hwy cruise RPM's down might get you to the 12 to 15 I was expecting you'd get.
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