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As others have pointed out on another thread, the sensor kits vary. I would say that $200 should be the maximum price for the hardware. The flexfuel sensor is a standard GM part. All of the kits will ultimately have to tie into pin #38 of the ECU for it to work. The rest of it is getting 12V and ground.
The expensive part will be the tuning device. I bought the HP Tuners suite for $499.00.
As far as the MPG goes. My first tank of E85 showed up as 66% ethanol due to the fact that I still had a few gallons of regular gas in the tank.
My average of 20.5 MPG was probably based on 5-10% ethanol. The pumps by me say that E85 is a minimum of 51% ethanol. Ethanol is a boondoggle in that it is "green". You would think that it would cost more to brew up a gallons of ethanol than to pump a gallon of oil out of the ground. I bet that it is not too profitable to brew it up at the full 85% ethanol, but who knows.
I'm gonna redo my math on my efficiency factor considering these things. But my gut feel is that the efficiency ratio is closer to 80%.
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