Went on a 122.6 mile freeway trip yesterday in our '06 V6 convert. Speed was held steady at 60 mph on cruise control. Used 4.027 gals. Filled up at the same station and same pump on return as when we went down. Cut return trip fill-up off at first click just as on initial fill-up. Made sure tire pressure was up to recommended specs. all the way around. Only mods I have is a K&N drop in air filter and the Flowmaster Am. Thunder single exhaust made espec. for this V6. Mileage came out to 30.44 mpg. Was I ever pleasantly surprised. I had heard that you can get 29 mpg highway with this car and this engine if you kept the speed reasonable, but the 30.4 was beyond my expectations. Could it be the freer flowing intake and exhaust with those two mods?