My wife and I just drove up to lake Tahoe for an overnight excursion. The drive was 270 miles round trip and up hill one-way and of course down hill the next. We drove with the A/C on most of the way up and back and averaged 20 mile to the gallon. This is my question are. Is that good gas mileage for our 2005 Sorento and can I do anything to up my miles per gallon?