If the blue temp sensor is disconnected you will get horrid mpg, and you'd notice a huge performance difference. It would cut power too, if the connection was intermittent.
I wouldn't be concerned about the fuel filter unless it is clogged, which you can flow test. But order one from germanautoparts.com under Corrado.
Check for boost leaks! 02 Sensor, if you have a aftermarket chip it could be also giving too much fuel - especially if you're running a M62. A lot of those chips have fuel curves specifically meant for the G-lader because it builds boost as it goes through the rpm's.
I get a steady 21mpg city w/s4 ported g lader s4 chip, 02 sensor delete.![]()



