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Old 02-05-2014, 08:26 AM   #3 (permalink)
Joggernot
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Get one of the gages. Above 42 mph, quickly lift you foot from the throttle and watch the instantaneous mpg on your SG. After a couple seconds it will read 9999 if you have DFCO.

Without the gage, vskid3 gives the easiest method.
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