> Does this mean I'll use twice as much gas when driving an ICE car at 85 vs 65? Probably closer to 50% more, because while drag is roughly proportional to the

> Does this mean I'll use twice as much gas when driving an ICE car at 85 vs 65? Probably closer to 50% more, because while drag is roughly proportional to the square of speed (which would yield ~70% more with this speed difference), there is also rolling resistance and powertrain losses - so the function of energy consumption vs speed is of the form: ax^2 + bx + c("c" being accessories like air conditioning).