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Old 12-01-2011, 12:31 PM   #247
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Originally Posted by st falcon View Post
Is anyone aware whether or not this TSB update will affect the milage? My 2012 gets worse milage than the 09 Focus loaner (which is a conventional 5speed!) we are driving after we got rear ended. My trans is sluggish and hovers arounf 2600 to 2800 RPMs going 70 to 75...SEEMS VERY HIGH, as the 5 speed 09 focus loaner hangs out around 2400 to 2500 at these speeds....I am going to call the dealer today while it is there getting body work done to see if it can be flashed...
Re-flashing won't change the cruising RPM (or fuel consumption) at 70-75mph. If you want better highway gas mileage, you'll just have to slow down. This is because they changed the final drive ratio for better low-speed gas mileage.

Originally Posted by cobie56 View Post
could the update adversely affect gas mileage, in your opinion?

Ford said the re-flash wouldn't change the gas mileage, but I think that's a lie. It doesn't shift up as early as it used to - arguably it would use more fuel, but it gets you to speed faster, so it kinda works out the same in the end. It hasn't changed my mileage noticeably.
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