Windows: it appears to be more fuel efficient to run your windows half down than it is to run your A/C. It's closer to the 2-3 mpg increase as claimed, however, there is definitely lack of power (peak boost is only 8lbs).Ī/C vs. Economy: 1.9 mpg increase (5%) compared to stock. it's not quite the 2-3 mpg increase as claimed, however, an extra 15hp and 53lbs of torque with no loss in MPG's is amazing. Stage 1 (Ariz, CA, NV tune): 1.14 mpg (3.1%) increase compared to stock. Just for fun, I ran 3 more variables (while on Economy tune) Stage 1 (91 octane, Arizona, California, Nevada tune): 36.67 mpg Stage 1 (91 octane, 47 state tune): 36.5 mpg I did 3 laps of every "tune," and here are the averages Mine is an older "version 2" that I bought used for $330.Ġ.75 mile loop in an industrial park, Set cruise control at 30mph in 5th gear, drive around in circles making notes of "trip mpg" on SG II at pre-determined "start" and "end" points, Reset SGII after every lap. You can find these used for about $300-350, depending on which "version" you get. All of these mpg claims were anecdotal, so I decided to put the claims to the test. Some users are even claiming 2-3mpg increase. The "word" in the Subaru forums is that the AP will increase 15 HP and 53 lbs torque while not losing any mpg's. I picked up a Cobb Accessport (AP) to dip my toes into ECU tuning to eek out some more mpg's on my 2013 Wrx Sti.
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