I don't have the engine fault code handy, but the light began to come on intermittently about two weeks ago. Brought the car to Mini and they re-programmed the car. No other engine mods on the car - stock thermostat was reinstalled a while ago.

Average mileage for 85K miles has been 27.6 mpg. After the re-programing, 23mpg is the best I can get.

Any suggestions before I take the car back? Or, just take the car back?

 

I had great results from taking my car to John at Lucky Dog Garage. He literally gets into the ecu in real time and can tweak it on his dyno for highest performance and often, better fuel mileage.

Some others are simply sending him their ecus and he's flashing them, also with good results (as far as simply sending it vs. tuning on the dyno goes).

Unfortunately, with over 100K miles on my two MCS vehicles, going back to early 2003, letting the dealer near the ECU has almost always had a bad outcome.

I'd suggest at least calling John and see what he suggests. He's helpful and BS doesn't seem to be in his DNA.