[bobcowan]

I run a bottle of Techron fuel injector cleaner throah all my gas vehicles about twice a year. I can't really say if it works or not, but I'v never had problems with clogged injectors.

Fuel additives are generally not effective to raise the octane level. There are some available for racing use. But unless you're drag racing and only need to treat a few gallons, it's usually not worth it. You're better of buying real race fuel.

I generally add a bottle of surfactant to the cooling systems on all my vehicles. Does it work? Yeah, I think it does. In general operation you won't notice anything different. But when the conditions get extreme, it seems to help. And the science is there to support it.