I have had a car for 10 months yes I'm in my infancy compared to the top guys on here. I use the heated air intake for better mileage even at 86° it pays to keep it on 10 miles to the gallon bonus in late May. I went to Lowe's and bought 12 feet long piece of tuftex clear poly carbonate skylight material for a barn. It goes from front bumper to back bumper drilled several holes and zip tied to bottom of car for the under tray. It works perfect don't know how efficient it is. Tires Bridgestone 92's psi 90 pounds yes 90 pounds I have aired up the tires 5 pounds a month more slowly taking chances. Just like Some members did 10 years ago. I'm getting 150 miles per gallon to work highway only. City traffic 70 to 87 miles per gallon . Got The yellow spare wheels 4in all guess what.? Not as efficient as 92's air them up to 90 pounds pressure before they equal performance of Potenza's. Only had the donuts on2 back positions. Going to put RE 92 on the yellow rIms soon. Not impressed with them so far at 60 pounds pressure 2 in the back of car it was like dragging a anvil. My next project will be taking out rear hatch 90 pounds weight replacing with 48 inch wide tuftex 8 feet long yes I'm going to have a see-through boat tail and I think it will look good and perform. I can get away with this I live in a small county little traffic mostly farming. I have friends that if I have a tire blow out they'll come help. Also took out rider seat noticed no improvement on mileage. Will also be taking out 70 pound battery with IMA bypass thanks to John and Harry. I have only copied other members progress except for one thing i'll save that for later. My thought is the best way to get better mileage air up the tires. It should be illegal that the people of America can't by car tires with a PSI of 100 or more. To me 44 pounds pressure is running on a flat. I drive semi trucks 120 pound pressure tires . If you take the weight of a semi truck and how much fuel it burns it's the most efficient vehicle on US Highway's. Anyway I was reading about the 505 ECUs from Firefox – diamond Larry – and Jeff from 10 years ago that's what motivated me to take these changes. My hobby is the Honda insight I love the smell of aluminum early in the morning thank all you guys who have made this website available to ordinary people like me. You may have noticed i'm not an electrical engineer or computer genius but the simple stuff pays off too.