You could take it to the shop, it could be something in the computer.
Or try some things yourself,
inflate the tires properly (the psi should be on the tire or in the owners manual), don't accelerate too quickly (that uses gas like crazy), go to auto zone or something and get some gas treatment, its a small bottle. You wait 'til the tank is empty then you add the whole bottle, then gas up to a full tank, do it every 1,000 miles. aaaaaand that's all I can think of right now.
