You know that idea of running techron through it and taking it for a long drive might work. No check engine light on mine, but noticed with the really cold weather and short trips I had been doing worse in MPG than expected as of late. Yesterday before making a five hour(each way) trip to Sun Valley, I thought maybe all the cold starts were making for a bit of carbon build up so I dumped some Lucas in the tank before heading up. I got 16.5 MPG on the way up and 18.5 on the way back, all highway and pretty flat. I was really surprised at the difference in mileage on the way back.
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1999 DII
2001 DII (w/ACE)
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