Ron bring me ur car and i will gladly check it out for free
Even the Ethanol cars i tune get alot better economy than urs.
But i have seen how u drive
And remember u had a stock dump pipe at the time of tune too which definately didnt help.
Have u upgraded it yet?
Have u replaced the 02 sensor? I have replaced an 02 sensor on a r33. Went from 300km to 450km economy.
Also may need to do a smoke test to be sure