ABC15 investigates gas quality in a national test.

It's our most comprehensive fuel testing ever.

Gas prices are on the minds of most everyone these days. You might think looking for the cheapest gas is the best thing for your wallet, but when filling up we found quality matters when it comes to performance and gas mileage.

Working with our partners at the Scripps Howard News Service, we collected one gallon samples of regular unleaded and premium fuel from 8 national brands across three states. These are the most common stations you will find here in Arizona or perhaps on a road trip.

The ABC15 Investigators will show you the results of this testing, how you can save money and protect the investment of your car or truck by making one simple change when you fill up.

See the special report only on ABC15 News at 10:00pm Tuesday, May 24, 2011

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