It looks like your truck, accounting for displacement, is geared about 15% taller than your Impala, and if it's chipped then a comparison would need to be stock or if the Impala was also running something to lean it out. I'm thinking your truck's Cd is closer to .3 than .4 if someone like Phil Knox is at .25, but that's just a WAG. How long is your route btw? If you had something where you could cruise at 55mph in OD for a couple hours (minimize warm up/trans losses), had the same gearing, and both vehicles were either stock or chipped, then maybe you could get a decent comparison, but as it stands I think there are too may confounds.
Quote:
Originally Posted by rmay635703
His old v8 350 Auto Impala SS is rated at 33mpg? That seems rather strange.
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Yup,
33mpg unadjusted (~55mph) highway for the Caprice/Impala. I wish I had that kind of tall gearing available for my Camry, although w/ a 5.7L I imagine it's about as tall as it can go. What would be interesting to see is what kind of mileage a T-56 and 2.73 rear end would get w/ the 4.3L V6 in an Impala/Caprice.