Michigan's current state average price for a gallon of regular gas is $2.50 vs. $3.16 for premium, a 66 cent difference.
Fuel economy for test vehicles averaged a 2.7 percent improvement.
According to the gasoline price website GasBuddy, the average price for gas in North Carolina is at $2.32/g as of Sunday. It was only these states that saw prices rise, ruining an otherwise countrywide drop in gas prices. The price in ME went down 3.9 cents to an average of $2.48 a gallon. "Drivers see the "premium" name at the pump and may assume the fuel is better for their vehicle", John Nielsen, AAA's managing director of Automotive Engineering and fix, said in a news release.
If premium is recommended but not required for your vehicle, it may not be worth the extra cost, which can run as high as 25 percent or more than regular gasoline, suggests research out Tuesday.
"The modest fuel economy improvements found in AAA tests do not offset the higher cost of premium gasoline".
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If you're buying premium gasoline for a vehicle that doesn't require it, you may be wasting your money, according to AAA. But that's just an average.
Test vehicles included everything from a Mazda Miata two-seats sports auto with a 2.0-liter four-cylinder engine to a Cadillac Escalade with a big 5, o-liter V8 motor. The story could obviously be different in vehicles that require premium, but in many cases these are high-performance cars where owners are happy to pay up for a boost in horsepower. But most engines are created to run on Regular all the time. A series of tests were conducted to determine whether the use of premium gasoline resulted in improved fuel economy and increased performance (horsepower).
"Each vehicle was tested on a dynamometer, which measures horsepower, and emissions testing equipment to determine fuel economy and tailpipe emissions when using both fuel types in a variety of driving conditions".