I try to hold my SUV to little under 85 mph. My '70 Chevelle SS 454ci gets about 8 mpg, ...but satisfies my need for speed ;>) Guilty as sin, ...on both charges. Go AMEP, ...I truly need the high grade gas and oil. But I did save an old mature hardwood forest from the loggers, and I only cut dead trees for firewood, ...my penance ;>) ...hawk