85 Westie started out getting 19+ on the road, 18 or = so around town. Slowly has decreased to 15+ on the road, 17 around = town.

The decrease I can understand, may need a = tune-up. But why the bigger decrease in road mileage?

Data: trip #1 with o2 sensor connected: 140 = miles /9.683 gal= 14.46 mpg

trip #2 with o2 sensor dc'd: 140 miles/ 10.316 = gal=13.57 mpg

difference, I think the fuel economy is actually = better with the sensor dc'd, but I can test that later.

I was truly hoping the fuel economy would improve = by dc ing the o2 sensor. I'd like to know what is "average" for a 84 = westy. Average-as in across the board if you toss out the 10 % that are = excessively high and the 10% that are excessively low.

End result in mpg testing is that when my family = goes to Florida next week, we have to take the 97 Suburban now because the mpg = is better...(wife giving her victory snicker in background).

Question: If the o2 sensor gives the ecu feedback = and (yadda yadda) gives you the best mpg, AND I am comfortable with the very = minimal mpg loss with it dc'd, can I run without it forever without hurting = anything since it drastically improves the driveability as above???

I can't wait to hear the thoughts of the = list.

Jay in Seymour = Indiana