602 Fuel

[ace1]

What fuel are you running in your 602? I have been using 110 race gas. Is it really any better than pump gas for these motors. I know pump is recommended from factory.

[Lizardracing]

Depends on the fuel used. If it were say, an oxygenated fuel than it may be worth a bit of power. Some of your answer will depend on the grades of fuel your getting at the pump. Some will better than others and you don't really have a good way of testing this without some dyno time.
If legal, I recommend E85 as it's also carries it's own oxygen and worth some amount of mid range torque.

Honestly put, 110 is most likely only making you faster by lightening your wallet. I'd put 93 in it if E85 isn't an option.

[ace1]

E85 is legal as of this year.