Personal preference is obviously the main underlying point. Im never satisfied with the stock performance haha and to me $150 per year to run a higher octane and more performance is well worth it. Reason I mentioned mpgs is because when you factor in the extra weight from tires, lifts, skids and other accessories it says a lot on how much tune helped with daily driving and maintained a more reasonable cost to the owner. Mpg are one of my biggest points with tunes, almost every tune Ive used has improved it while increasing performance