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Gas milage plummeting
Posted by cryptical [Email] (more from cryptical) on Mon, 25 Jul 2005 13:06:05
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2003 9-5 Aero with 25,650 miles -
When I first got the car in Colorado, even with their highest octane of 91, I was averaging 27-28mpg all around between highway and city driving. Moved to CT and averaged about 34mpg on the highway across country and 26-27mpg for the following 6000 miles until the engine was rebuilt due to oil consumption. After the rebuild, I was getting around 23-24mpg and it's been going down to 20-21mpg. Just had an oil change at 25k miles and mentioned my milage to the service writer. Tech reset something (guess ECU) and cleared SID. After about 650 miles, I'm now getting about 12-13mpg on mainly highway commutes about 50-60 miles each way.
Car had new plugs put in with DIC at 14k miles, other than that, just seems to be a little slower since they reset the ECU (haven't done the boost adaptation yet). Otherwise, driving style hasn't changed, no traffic...etc. Have used Techron, tires are at 37psi front and 36psi rear.
Any ideas on what I can check out before I make an appointment?
Thanks in advance.
posted by 24.151.98...
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