I would strongly advise against tucking your sideview mirrors. It is not worth it safety wise and aerodynamic wise. You will save more by accelerating as slow as the driver behind you will tolerate. I get 49 miles per gallon on average, in colder weather than Tampa. Though I have a CVT and probably get a little more because of that. It's good to be under 60-I keep to 50 when I can.