You want cheap fuel right?

I think this is what you are looking for:
http://www.davisdieseldevelopment.com/
Be aware it is not with standard diesel from the local gas station.

Other option is to wait for the new HPI models with 15cc gasoline engine.


A much simpeler way to go cheap is to remove 0.1mm or 0.2mm from the headclearance and you can run 10% or even 5% nitro fuel which must save a lot, for sure if you do mix it by your self.