Turner Motorsport Chip

[JayBMW535]

I have a Turner Chip in my 90 535, I have been thinking of putting the stock chip back in. That way I don't have to run Premium fuel. What is the going rate for a chip. I have the original box and sheet for it. It is not one of those imitations from ebay.

[632 Regal]

you will lose more MPG with the stock chip that the added cost for premium fuel. I dont know if your chip increases mileage though.