I experimented for a time with an alternative power source. I found my truck, though slower overall, ran much quieter (especially noticed from inside the cab). My fuel cost was zero resulting in a possible infinite MPG rating. However, I was forced to return to more conventional power because, although the truck moved fine on level or slightly down-hill terrain, my wife simply couldn't push the truck uphill!
Other benefits were thus: I no longer had to pay for her gym membership. I noticed my house also got more quiet. And although the heater in the truck didn't work, it got so cold at home that I didn't need to turn on the AC!
Now I'm looking forward to another economical mode of transportaion because if she reads this, I'll be walkin'!!!
Craig