Originally Posted by vipor

According to my GasCubby app I'm averaging $2.76/gal for 93 octane premium. I'm at a total of $942.05 spent on fuel so far for 6,397 miles. If I were to knock off roughly 30 cents/gal to switch to 87 octane I would've saved $102. It's roughly a 10% change, well worth it.

For me anyways, I find it very obvious when a car is running higher octane gas. I've run it ever since I was 18 in everything I've owned including a 71 c10, 87 accord, 95 dodge spirit, 97 240sx, and now my Z. I cringe every time I hear a car that's driving around pinging like crazy, but people are gonna do it. In a van or work truck or Kia, go for it. If you're driving a sports car or a turbo vehicle you should be running premium, or you're just asking for at least 10% less car.