Quote:
Originally Posted by dholloway543
I understand that flex fuel might be better but why pay for something that already works?
How hard is it to flash a tune at a pump as you fill up anyway?
Money plays a role too.
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The main difference is on a turbo car especially you want the car to be the most dialed in it can be. Pump ethanol varies day to day or even pump to pump. In the U.S. some ethanol pumps can be as low as 51% and not true 85%. So if you get tuned on e85, then you go fill up at a pump that has 51% ethanol there's going to be a difference. You can't flash back to the 91 tune, but the content in your car won't match what the car was tuned to. The flex sensor would ensure that no matter what the percentage of ethanol is the car would still be in tip top shape.
It's money well spent in my opinion. The feature is safety, the side effect is not having to switch maps around all the time.