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Old 02-03-2016, 05:57 PM   #33 (permalink)
hackish
Calibration Engineer
 
Join Date: Jan 2010
Location: Canada
Posts: 86

Subie - '00 Subaru Impreza STi JDM
90 day: 22.49 mpg (US)
Thanks: 1
Thanked 18 Times in 14 Posts
You need to reflash the ECU for this. Nobody has bothered to develop such a thing because there is no money in it. There is a fair bit of economy left on the table but at the expense of tailpipe emissions. Changing the shifting program is one of the most effective ways to do it without changing the tailpipe output.

-Michael
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