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What are the OD ratios? Is the truck stock or chipped? Where are you getting a Cd of .4 for your truck? What's your driving route like?
Your Impala is rated at 33mpg highway (unadjusted) according to fueleconomy.gov so you should be getting pretty close to that unless your route isn't mostly highway, in which case your truck is probably doing better because of the manual trans/lower idle fuel consumption or because there's something really off w/ the Impala.
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