Exactly, go as high as you can without venturing into race-gasoline. Although race-gas it nice to use when you are going to try racing the car or want to test out high nitrous shots.
I wouldn't use lower grades of gas especially with nitrous. Have you seen was detonation looks like when hitrous is involved? It'll make a hole in a piston in a few seconds!
Ps say hello to my co-workers at SKF-Gotenburg!
