Hmm. I'd be a little more open minded about this. Running a 93 octane tune with 93 octane gas is going to allow you to achieve better gas mileage. I've done the numbers and I nearly break even. It's not worth it to not run it in my mind. Not only is it going to give you better gas mileage, more power, it's going to be much better for the car. But if you can't get past the cost and want to run 87 octane, it's still going to be a BIG difference. If you have an automatic, it's going to be a HUGE difference. It's worth it. 93 octane is REALLY worth it.