Originally Posted by Doc Fiberglass
To the E85 guyz .... not racing myself now but most guys in this area have stopped using that because the formula can radically change from load to load. Most of them have switched to straight alky

You definitely want a test kit and basic math skills.
I keep a 5 gallon can of E-95 laying around in case I need to sweeten what comes out of the pump.........by mid July , most of it is 85 %
But here in Mn. , they don't fill the tanks with actual E-85 until June 1.
It is E- 65 for cold weather starts from November till then.