Fuel
Fuel isn't rocket science guys!
Only three components in fuel:
Alcohol - Oil - Nitro Methane
If your car goes faster on one fuel than another it's because of more nitro or more alcohol and that's it!
If a certain brand of 20% fuel is faster than another brand of 20% fuel then the faster of the two has less oil and more alcohol.
If you want your engine to last longer run more oil, if you want to go faster run more alcohol and nitro.
That's all there is to it guys!