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Old November 2nd, 2005, 10:25
rstarch345 rstarch345 is offline
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Join Date: Apr 2005
Location: Where ever I can wheel
Posts: 761
Re: Where the gas mileage go?

I'm going to presume that you have over 100K on your '99. The O2 sensors would be a good bet to look at. Then, I would check the CAT if they didn't solve the problem.

I've recently had a drop from 16-18 to 12-14 MPG and it was attributed to a bad CAT (sounded like a tin can with BB's). I went ahead an replaced both sensors with the CAT and I'm back to normal.
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