Many higher-end high performance cars actually need the higher octance fuel and you lose gas-mileage when you use the cheap stuff so it may be worth it to get the higher octane. I personally notice a huge difference between regular and premium in my car. With premium, my car idles smoother, rides lighter, and has better acceleration overall. Last week, I put crap ass Albertsons regulr gas in my car when they had it on sale for one day for $1.19 and my car ran like crap. As soon as they tank went down about halfway I got some nice shell premium 93 octane to help dilute out the albertsons crap. Car runs much better now.
