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rule of thumb gas savings 70mph 55mph 40mph
Does anyone have rule of thumb for how much the typical fuel usage changes say cruising at 70mph steady state, then at 55mph, then at 40mph, for different sized vehicles? (everything from motorcycles to schoolbusses ideally but just some generalized figures since the level of aero and weight may skew the results too much to give just one figure for everything)
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