So I had been getting consistently 16.5 to 16.7 mpg from my drive to work and back. I baby it and that's what I get. I put in 89 octane while towing my boat a couple weekends ago and when I returned I had a half tank. Got 12.7 pulling by the way... Anyway, reset the MPG computer when I returned and when I looked a couple days later it was at 18.7 mpg. I filled up one more tank with 89 to see if a fluke and low and behold I am getting between 18.7 and 19.0 mpg. This seems crazy? It is about a 12% improvement, but the gas costs about 12% more too. Anyone else tried or noticed this, or have my new tires just broke in enough that I can expect this MPG all the time.