propane injection in small kohler diesel
 

I have a small kohler engine (KD-350) that i was wounder if it would be possible to have a propane injection system on top of the diesel fuel for added horsepower and hopefully fuel economy. Another question i have is it worth it for fuel mileage? The reason we want to convert this is because we are making a SMV car (super mileage vehicle) and my team is shooting for more fuel mileage but by the time we are done (if it's possible) will it make a big difference or will it not be worth it? Thank You.