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In April, a gallon of regular unleaded cost an average of $1.74. Now, it’s $2.10 — though that’s still about 70 cents lower than a year ago.

According to the National Tank Truck Carriers, the industry's trade group, somewhere between 20% to 25% of tank trucks in the fleet are parked heading into this summer due to a paucity of qualified drivers.

For those looking to travel for spring break or this summer, experts say drivers can save some cash by doing a little research and planning out stops to get gas in states with lower taxes.