I have heard that the silver crown teams will get their fuel for free so that will save the teams some money. You will burn less fuel with ethanol but your motor is going to run approx. 35-60 degrees hotter. So in order to get the temp back down to a comfortable level you are going to have re-engineer your plumbing system to try and cool the motor better. Bigger radiators are going to be needed. For the fuel system you are going to have to change the fuel pump from say a 450 flow to possibly a 300 flow. Smaller nozzles, smaller diameter intake stacks. What everyone doesn't realize is the issues that the valve trains will have at a places like Iowa or even the dirt miles.