QUOTE (circle8track)
While we are talking about 3800. We have a 04 regai and all we can get for miles per gallon is about 21, has anyone else had this problem??
Aaron,
Is the cat plugged? That'll make the back pressure go way up, and then it'll knock, and pull timing. Updated ROMs can help too if they have made a service release for it.
Mine is gonna be getting the cat sawed off and a O2 simulator plugged in where the rear O2 sensor was. I took it apart at 196k when I had some misfire issues, didn't look plugged, but I don't want it to cause trouble later, and it's effectiveness is probably worn off by now, so it's not doing the environment any favors.
My park ave has been the most bulletproof car I've ever had. I change oil filters everytime the light comes on, and top off the mobil 1, then do a complete change with mobil 1 every other time the light comes on. Other than that it's been belts and fluids, and plugs... I did have 1 bad plug that caused the misfire problem I noted above. I also swapped the coupler out on the supercharger, they only last about 125k, but it's a $30 part.
Funny thing is that it gets better mileage than the wife's brand new Nissan Versa, but not as good as my 86 Grand National, so the newer the car is the worse mileage it gets, I guess. Or maybe the more power it makes the better mileage it gets?