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Originally Posted by Powaup
I was expecting 30 mpg on granny mode, at least 28 but instead I'm getting 24 at the most..
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Keep in mind that people beat EPA numbers all the time using your "granny mode".
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I hope the range on a full tank is more than 400 miles.
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As noted on the specs page linked to in the OP, it's a 15.8 gallon tank. So you need to average a bit over 25mpg to get 400 miles (exact number depends on reserve size and how close you are willing to push it toward E). Should be very doable on a long trip, but perhaps tough during a normal week of commuting. We'll see.
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Now I see why the next gen M4 is going to be 4 cylinder hybrid no way we're gonna make that 35 mpg combined with these current engine layouts
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The powertrain for next M3 has not been chosen, nor did the article to which I believe you refer claim that it was. CAFE targets are a fleet average, by the way. Not every vehicle must get those numbers for the manufacturer to avoid fines.