Also off road packages and tires don't change EPA ratings even though they clearly affect gas mileage. So they get to use the same aero numbers even with big flairs, larger tires and a 4" lift. A Ram 1500 with Rebel package get the same rating as a standard Ram 1500.
Similar with 2 models built on the same platform like a Lincoln MKX and a Ford Flex. The MKX has better aero but the epa let's Ford rate them identical maybe so they don't compete with themselves?
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