More like wind resistance - I got 17mpg on the street tires on the first trip, driving 75mph. I noticed long ago that the Gen1 sweet spot is around 65mph... might be better at lower speeds, though.... I just can't seem to drive any slower than 65 on an interstate highway and maintain my sanity. <img src="/forums/images/graemlins/lol.gif" alt="" />

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum