EPA testing doesn't include any grades because it's done on a Dyno. The ratings are based on five litmus tests (city/cold start, highway/warm engine, high speed, warm weather w/ac, and cold weather w/heat) th at measure fuel use and emissions. There raw numbers are fed through an algorithm based on weight and wind coefficients.EPA rating is base on mixed highway driving does it not? Which means they include driving up grades. If you drive on the flat lands and do a lot of highway driving it's not hard to exceed the rating. I get 4-5MPG better than my vehicle is rated for most of the time, unless I head into the mountains, then it goes down like a rock in a lake.
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