The fuel trims that I got after diving ten miles at 55 mph on cruise were--- Long Term Fuel Trim Bank 1 - 6.2 Long Term Fuel Trim Bank 2 - 1.6 Back to 0 at idle. Short Term Fuel Trim Bank 1 - 2.3 Short Term Fuel Trim Bank 2 -( -2.3) Opposite of 1

I have a 2012 F150 Platinum w/ 3.5 turbo charge engine and only 20,000 miles on it that started getting 23 mpg and now is only getting 13.5 - 14.7 mpg. My customer has taken it back to the dealer where is has gotten the vehicle from and was told nothing was wrong with it and was sent to a major Ford...