>>I once drove some 3,000 miles in Canada, in an old Jetta diesel, and came back with more fuel than I started with!
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>>I have decided to invent a car that does that. You have to start trips on empty and it will fill the tank as you go. I think taking the motor out and turning it around may cause that effect. Just think, you could pull up to the gas station every 300 - 400 miles and sell THEM the gas in your tank! After I perfect that, I'm going to build an oil tanker!
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>Couldn't you just drive backward everywhere instead of messing with turning the motor?

I think not! Logically, we know that when we drive in reverse, the motor is still turning in the same direction, it's the transmission that gets confused. Therefore, you MUST invert the motor for the desired effect.