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crappy econ w/ mileage xs

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Neumannatr
 Post subject: crappy econ w/ mileage xs
 Post Posted: Tue Oct 28, 2008 9:32 am 
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Joined: Wed Apr 09, 2008 7:51 am
Posts: 13
just updated my cortex 2950 for my 07 duramax lbz and my mileage dropped from 23 mpg while on performance tune down to 17.5 mpg while on mileage xs programming. Same drive, same speed. WTF? I thought I would have gotten better mileage on the xs programming. Any thoughts Ron? The serial number is 1348662 and it's the cortex 2950. Mfg. date of 10/26/2007
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RON @ SUPERCHIPS
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 Post Posted: Thu Oct 30, 2008 8:45 am 
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Joined: Tue Jul 25, 2006 9:41 am
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Location: SUPERCHIPS
How many tanks of fuel have you run in the new tune?

Lost in mileage can be related to so many factors.

Ron

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