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Gas has gone up more than 40 cents in the last month, and according to Triple-A, the national average now sits at $3.54 a gallon. You probably know that having enough air in your tires is important, because it can improve your gas mileage by about 3%.  But here are five more sneaky ways to save money on gas.  #1.)  Buy Gas at Night or Early in the Morning.  Gas stations store their gas underground