If it has been a year or 15,000 miles, your engine could have already built up deposits. Dirt, varnish build-up, corrosion and carbon deposits restrict the flow of air and fuel to your engine. This happens with all fuel-injected vehicles.
Deposits in the fuel and air intake system that cause:
Loss of power
Poor fuel economy
A need for higher octane gas
Completely clean the entire fuel system of deposits:
Throttle plate and throttle valve
Restore the fuel system to its original design for: