Supplement gasoline engine with electrolysis module to produce Brown's Gas from water. This will increase level of hydrogen in air going to engine enabling more efficient combustion process -> lower gasoline usage / improve MPG, reduce emissions, but without losing power. As gasoline is still the primary fuel, there is no 'range anxiety' that you get with pure electric vehicles. But this approach can lead to significant improvements in MPG. The improved combustion process more than offsets the power required to power the electrolysis module.