Interesting question, Ratio Effects?

With electrics its heat and I'm guessing eventual increase of resistance thru the motor and loss of battery and overall power. In a car, it's use of fuel and response. The difference is an electric motor develops full power immediately. It's 1 or 5 or 30hp within several degrees of it starting to spin and it doesnt get more powerful unless more power is run thru it. A gasoline engine, because of the physics involved, does not have a linear power level. It's a curve. So for any given engine, there will be a perfect final drive ratio that gives the most economy and the most response. However, that perfect ratio... Will be different for every driver that uses the car... It's personal taste you're trying to match unless you remove variables like snappiness, economy, and power.