Found this in AAA's Car and Travel Magazine today-Could be of interest for those who are currently filling up with Hi-Test:
Why Pay for Premium Gas?
Do you spend $200 every year on octane that you don’t need?
To rein in budget-busting gas prices, maybe you need look no further than the button you press to pick a grade at the pump. If you usually fill up with highpriced, high-octane gas, you could save $6 or more per fill-up by switching to good old 87-octane regular. You’ll notice a difference in your credit card statement, but probably not in the way your car behaves.
According to AAA’s most recent statewide Fuel Gauge Report, premium gas costs 31 cents more per gallon than regular; midgrade, about 23 cents more. Despite their higher costs in a time of rising overall gas prices, premium and midgrade still account for roughly 17 percent of the market, according to the U.S. Energy Information Agency. Some people opt for higher-octane gas because the owner’s manual tells them to use it in their cars. (Actually, carmakers recommend premium gas for only about 5 percent of all models.) Other folks buy premium because they believe it gives them better mileage or more power. Still, others splurge on an occasional tankful as a treat for their car, much the way you might indulge your dog with a juicy morsel of steak every now and then. Unfortunately, all these reasons will waste your money....
http://carandtravelmagazine.com/Cara...remium_Gas.asp