It seems that the average full sized truck is geared for torque and towing power even though most of the time most of us drive around with a empty bed or not towing anything. In 4x4 trucks there is a low range gear box to help when you need lots of power. Could the same technology be used to create a better gear ratio for increased MPG when not hauling/towing in standard trucks which you would then engage a 'tow' gear ratio when power is needed? But have better MPG on a daily basis.