The other day I drove to Ocala and back and used 3/8 of a tank of fuel for the 120 mile trip. Rough MPG was 13.3 This morning I made the same trip on a 1/4 tank for a MPG of 16. The only thing I did different was I didn't run the A/C until I was about 5 miles from the house. Would the compressor pull it down that hard or have I actually increased the VE of the engine that much? This morning I did have a valve tick for the first 30sec on cold start so it could be plugging lifters a little.