Also the guys at FFTEC turned me on to this stuff:
Can be found at Walmart and one bottle will treat 2 of our tanks (30 gallons). After I used half a bottle and swapped injectors, they were super clean. Before I treated the fuel, when I pulled out an injector, there was this brown sticky substance at the tip of the injector. It appears to be almost a caramelization of the sugars in the ethanol to the fuel system. one tank and the other injector I pulled was completely cleaned. It's probably worth half a bottle every 2-3 tanks. Super cheap at Walmart.
2007 E92 6MT SGM: MusicarNW Level 2, Procede Rev 2.5, FFTEC/Vishnu LPFP with Flexfuel Sensor and Flash, M3 Offset V701's, WaveTrac LSD, Michelin PSS, Downpipes, M3 Control Arms, TCKline D/A Suspension, LCI Tail lights, Lux AE's, ER Charge Pipe, DCI's, Mtech Front and Rear, M3 Sideskirts, HPF Stage 1 Clutch