I have a 2015 Accord EXL, nothing done to it at all. I have had 5 gas fillups, 3 in town and 2 on the road (I70 and I15) from Colorado to Las Vegas. My town MPG was 33.9 which I thought was very good and I wanted to see what I got on the road. Well on a 1000+ mile trip (very little driving in Vegas) I got 33.5. What gives?