[coyoteX]

I had 175/70R13's and went with the recommended, P165/70R13, Sumitomo HTR T4's and averaged almost 5 mpg better. These are LRR tires and they work pretty good in rain and snow. With all of the variables in real world driving, I don't think the full rear fairing is practical. If you are headed to Bonneville, then absolutely, you will need it. I still say, start with installing a vacuum gauge and learn how to use your right foot. I believe a few years ago, a guy entered one of these cars in a mileage event and averaged 108 mpg. That was on a closed course, fuel economy event, probably 45 mph top speeds, not the real world. Mirrors, passenger seat, spare tire and any unnecessary weight were removed. I believe he taped all body gaps and rolled window down to get in and out. Oh, he did make his own version of a nose that was quite a bit larger than mine. It reminded me of a cow pusher on the front of an old train.