Thread: gas mpg

Just wondering what could be issue. I know alot of things can cause bad mpg but the thing is the message center says 18.1 cty at best 18.3 hwy now i think even if something is affecting mpg there should be more of a gap for hwy than that. the check engine lite has been on so i did a scan only to get a code that say catalyst below threshold on bank one. I think this refers to the cat maybe stopped up dunno any help would be nice thanks in advance

your catalytic converter needs to be replaced

how much gain did you feel from the res,ubend del

Originally Posted by chad27

how much gain did you feel from the res,ubend del

along with the cat, all 3 of them were removed at the same time, i felt a little bit. nothing to write home about, but the gain was certainly there, along with a nice new sound. (keep in mind "nice" is an opinion word)

A few things.

1) Resonators do nothing for performance, they are just a "sound part" of the exhaust. Gets rid of resonance or drone in the cabin during cruising. Keep it in there if you like your car to sound good.
2) Low Catalyst means the cat is most likely bad. Cutting it and the U-Bend out NOW would be a great upgrade for your car.
3) Don't go by the DIC. It isn't very accurate. Go fill up your car and run it down to hardly anything. Fill it back and see how much gas you put in it. Then figure your mpg's that way but taking how many miles you drove divided by the gallons of gas you put in. WAY more accurate, even though it is old school it works better than a computer IMO.

thanks for the info

Getting rid of the resonator makes a 3800 sound nearly as bad as a Honda IMO.