That's what I'd always thought, although in new car's it's going to be more complex. A different tourque curve may lead to them fitting taller gears.
They mentioned on Top Gear that the supercharger on a McLaren Mercedes SLR "costs" 120+bhp just to run. That can't be good for FE.
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58.35 MPG last tank = 127% EPA
49.23 MPG 9 tank average = 107% EPA
66.11 MPG best tank.
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