First tank went 717 miles. When i filled up, it took 15.6x gallons. Averaged out to 45.1mpg, thats triple what i was getting before. I didn't change my driving habits at all, still drive 78-80mph for 85-90% of my commute. Plus my rear brakes were garbage metal on metal and dragging, and all 4 tires had excessively different pressures, for about half of that tank. When the fun of driving it slows down some, i will try harder to get a better average by driving slower, coasting more, shifting at a lower rpm etc. etc.
Cant complain about that