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Customers who buy a 2010 Suzuki Equator between May 1 and Aug. 31 will be eligible for the automaker’s “Free Gas for Summer” promotion. Buyers will get a stored-value debit card with which to buy gas.

The cards will range in value between $280 and $442, depending on a number of factors. Apparently, Suzuki will take into account an assumed three-month time frame, the car’s EPA highway mileage, the national average price for a gallon of gas and the Federal Highway Administration’s estimate of 1,000 miles driven per month.

If we have Suzuki’s reasoning right, you might want to wait until around July, when gas prices tend to peak. The higher the national average for a gallon of gas, the more money Suzuki will have to put on the debit card.

Suzuki’s seven-year/100,000-mile powertrain warranty is transferable at no charge to subsequent owners, whether they’re the second or sixth owner. Some manufacturers’ extended powertrain warranties apply only to the original owner or the duration of coverage is reduced for second and later owners. Not so with Suzuki’s. All the time and mileage that remains can be transferred with no ups, extras or deductibles.