I'll be installing the KTuner setup in my car this week, so I'll be able to provide some metrics shortly. I've been tracking my gas mileage since day 1 (about 13K miles now) and I'm seeing an average of 27.58 mpg (this is the fuel app average not the dash) in heavy Bay Area traffic.Odd question to ask in a performance thread maybe, but have you noticed any highway mpg gains with the tune? I've been unimpressed with my 28.5-29 mpg average on the highway from the stock tune; noticed no improvement after installing 17" all seasons for winter either, but the colder temps and winter fuel might be at play.
85 mph interstate driving clearing isn't helping, but I thought I'd see better. Even with a huge tailwind, 33 mpg is about the best observed on the interstate...thinking it must be just enough into the boost at these speeds to impact mileage noticeably. I picked up 1.5 mpg with a 80 hp tune in my Powerstroke and am hoping a similar situation might occur with the Accord...more power and better mileage!
In general, you should see some slight increases in gas mileage as these tunes run a bit leaner than factory. Although, it may be cancelled out depending on how you drive :wink .