This one is about MPG. A couple of weeks ago I drove up From Salisbury, MD to Rochester, NY to pick up my daughter for thanksgiving. Temperature at Salisbury was mid 50s when I left, was averaging about 19mpg (display). I noticed that as it got colder, my MPG dropped. Rochester was in mid 30s and I was barely making 17mpg as I approached the city - yeah I was running, but I did the trip in August also and never noticed that kind of difference. I couldn't believe it. Then I noticed same thing on return - MPG got much better as I approached warmer home climate. Yesterday it seemed like we had a heat wave here - 60s - and I had to go to the DC area. MPG was near 20. Returning today, temps were in the low 40s, maybe even lower, and MPG dropped to near 17. Never noticed this before. What is wrong? There's got to be some logical xplanation.