I have a 05 TL and im haveing Problems with the Gas....I have changed the Air filter and oil... i have used the fuel cleaner also..but nothing works...I have timed out the trip from a full tank of Gas to empty...i drive under 3500 rpm ... but everytime i clock at 210 miles i have to fill the tank of gas again... i know thats not right for this car .. something is wrong with the car ... Someone Help...

 

Wrong forum, but I once had problems like that with my old RL. The rear brake calipers had seized. Also maybe something wrong with the fuel injectors?

 

You prob need to open engine up to really tell.
But here are 2 tips ...
1. Fuel Injectors often get fouled and require physical cleaning or replacing
that the chem solution do not solve.
2. Check for proper working of your 02 sensor.