Here is what I have. I have had my 2000 MT Insight for just over a week, 133K miles. Average mileage (90% highway, 175 miles/day) is 58mpg. The car had a new set of Michelins on it. I have found 2 lightly used (80%+ tread remaining) RE92's. I am guessing to put them on the FRONT for best mileage? I am still looking for a couple more used ones, but money is tight. I am REALLY hoping this will get me better mileage (I am running 45 PSI). Anything else to look at? Oh, the IMA is on- I am waiting for grid charger.