Well I'm over 700 miles now and I've noticed a very nice mileage increase! I was averaging 22-24mpg in mixed driving, recently I've begun seeing 26-28 and today 30mpg in the same mixed driving! I did check tire pressure and found it at 38-39, dropped it down to 36. I have also started using the more expensive gas stations in the area, Stewart's and Sinco, still using 87. Not sure if this is a fluke or things are breaking in! As love as it lasts, I love it!