Reasons for possible bad MPG
#1
Reasons for possible bad MPG
I used to be boosted a few months back, but decided I wanted to go back to stock and retain my lovely 23mpg in the city. Well, ever since I put my car back to stock, stock injectors, stock intake...but I notice, i'm only getting 18 or so MPG! I DO still have a 2.5 inch spipe back exhaust on. It has no cats and a Magnaflow muffler. Could my large exhaust be the cause of my 5mpg loss I am seeing in gas mileage? I plan on putting the stock exhaust back on, but havent' had the opportunity. Any ideas?
#5
No I do not. Completly stock now. the only thing that is not stock, is the midpipe and axel back portion of my exhaust. I was under the impression that that shouldn't cause my decrease in MPG but i'm up for ideas!
#8
Cats -1,2 or none - aren't going to noticeably affect your mileage. If you had a bad O2 you'd have a CEL.
Is your s-pipe 2.5"? If so that's a full 2.5 exhaust, you have less low-end torque than when you were stock and maybe you're gassing it more off the line to compensate.
Otherwise, go easy on the throttle for a while, wait a couple more tank fulls, then see where your at.
Is your s-pipe 2.5"? If so that's a full 2.5 exhaust, you have less low-end torque than when you were stock and maybe you're gassing it more off the line to compensate.
Otherwise, go easy on the throttle for a while, wait a couple more tank fulls, then see where your at.
#12
Originally Posted by cmv138
your car hates you for taking away the boost so it's making you pay for it!
#13
Originally Posted by 07_Tc_blacksandpearl
Try resetting your ecu... Just take of the battery negative terminal for a bit and let everything reset. Then let your car relearn the adaptation values for idle and load and see where your at.
#15
The O2 sensor can be working but out of spec and producing a richer than normal mixture causing MPG loss. You could have also lost some compression from wear in the cylinders/rings when you were running boosted. Compression check would be the first thing to do and maybe an exhaust gas check with a CO2 meter and hydrocarbon check. Change the oil in the engine and tranny since they both got beat up when running boosted. Front end alignmant check and tire wear - all that torque may have bent something too. Did you run a lower temp thermostat?
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