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Gas mileage? WTF

   
Old Nov 25, 2006 | 06:03 PM
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Default Gas mileage? WTF
Ever since my retune and lt's and cat delete my Mileage sucks. Been getting 10-13 average. I was hoping the Efans and New CAI would help but didnt.
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Old Nov 25, 2006 | 06:09 PM
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What kind of tune? You done any logging to see what your AFR's are?
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Old Nov 25, 2006 | 06:12 PM
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nope... wait4me
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Old Nov 25, 2006 | 11:52 PM
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how many miles you put on with the tune? ive heard that it takes a couple hundred miles for some stuff to be learned... try the next tank and see what happens.
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Old Nov 26, 2006 | 12:09 AM
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yea with the w4m tune it takes awhile for it to get good. thats all i got on my 4.8 and i run with hemis. wee.
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Old Nov 26, 2006 | 12:26 AM
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How long ago did you remove the catalitic converters? I know that this is typical to loose some MPG when the cats are taken off. I have considered doing this on my truck. How much of a decrease in MPG?
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Old Nov 26, 2006 | 05:42 AM
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Originally Posted by Black Nali
How long ago did you remove the catalitic converters? I know that this is typical to loose some MPG when the cats are taken off. I have considered doing this on my truck. How much of a decrease in MPG?

I don't understand how you would loose mpg with no cats? The front 02 sensors are still mantaining a 14.68 a/f ratio, verified by the wideband...
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Old Nov 26, 2006 | 07:14 PM
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tune has been in for a awhile, its taken its course ive had about 3 retunes and its been about 2 months or so since i got the new tune in and 3k miles plus.
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Old Nov 27, 2006 | 12:18 AM
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did you do a crank relearn? if not, your converter wont be locking up
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Old Nov 27, 2006 | 12:23 AM
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do you have to do a crank relearn when you replace the PCM? in the gm service manual it says you have to do it when you replace the crank pos. sensor of course.
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