Hi, I am glad to be a new member of this forum. We have a 2006 civic hybrid with approx. 6,500 miles and have the goal of someday reaching 100 + mpg. Our best tank thus far has been 66.4 mpg on 11.3 gallons of gas. We have 51 psi in the rear tires and 49 psi in the front tires. We just replaced the factory oil with Mobil1 0w-20 (3 qts. only instead of the 3.4 listed in manual) and replaced the air filter with a K&N. We really enjoy driving this car. It is by far the best car I have owned and enjoyed driving. The current name we have for this car is "Silent OPEC Nightmare" which we feel is very fitting as gas prices are now beginnng to come back down some. We have solar panels we would like to use to fully charge the battery when it is parked. Do you know how this can be done? We were also considering covering the raditor now that we have cooler temps but do not have any data that would support a MPG improvement.