Just got the FS3 installed in my 1999 camry 4 banger, I have a ultragauge set up and just filled up to a full tank. Last tank with just the ultragauge I got 26 mpg, I have the same driving schedule lined up for the next tank so I will let you all know how it goes. It says its takes 160miles to optimize, I usually get over 400 a tank so even with that I should see a difference.
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