Recently I posted about my bad gas mileage. Tried a variety of things and changed a variety of things ($$$$$) until recently I had the gas tank repaired. Tonight, I did 350 kms at an average of 120 k/h and got 6,8 Liters per 100 kms. I found a conversion web site and it gives me around 41 Mi/UK gallon. My Camry is a 1993 4 cyl. Not bad, huh!?!?!?!?!? I use synthetic oil. There was no visible leak on the ground. The mechanics said that the dirt on the tank acted as a sponge, explaining why there was no drops on the ground.
JP