Fuel MPG getting worse after custom tuning - Saab Performance Bulletin Board - Saabnet.com
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2003 9-5 Aero. Computer was custom tuned at SOC by one of the reputable tuners. On the 4 hour trip home I got nearly 30 MPG. Been getting worse ever since. I drive 35 minutes to / from work each way, mostly 70 - 75 MPH highway driving. Trip home from SOC was 80 - 85 MPH. Have made a few 2.5 hour trips and the best I've gotten is 24 MPG.
Any ideas why the MPG would be getting so much worse? It's down to 20 - 21.
Thanks.
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