Congrats again Henz awesome power on 98, im sure those 295s are bald allready ;-) , to what impellor said yes if using e/flex it can vary from E85 to E70 that's why we get tuned on United E85 as it is consistant all year round, I have a Zeitronix ethenol gauge so I can say that I have never seen more than E87 and less than E84. Henz I drive my ute now for 5 days every 5th week and the fuel sits for the 4 weeks and I have never had a problem. I know you have your doubts, and im sure you have herd it before, but the difference in power delivery and how smoothit revs is crazy not to mention less boost for same power. Only down side I can see is you would have to upgrade your fuel system. You know you want too!