I'll just post this here instead of my or anyone else's build thread as it's something that would interest other potential builders. It's the mileage, I've been fucking with it and fucking with it and fucking with it as I'm OCD and I just don't know when to stop. Also, I'm planning on doing the Dempster and the difference between taking one gas can and two makes a difference on a 10k mile round trip. Less crap=mo betta. Soooo with full dual exhaust and a O2 sensor dummy plug I would get right at 58mpg on average keeping the speeds down to 55mph. Now at this point I should just say that I'm to the point of calibrating the speedo in the thousandths of a percent and it's dead nuts on. So much so that I can measure error as my tires wear. Honda did build some error into it as the odometer now over reports at 1.04%. I could calibrate it either way so that one is tits on or the other but I prefer the speedo to be correct as our hyperactive cops love to hand out tickets in my town. I've been doing all my mileage checks off GPS mileage on two separate units and I was getting an honest 58 mpg... which I was not cool with. I've since built an H pipe in with the factory O2 sensor mounted in the H pipe and low and behold it jumped up to 66mpg. Which, if you cuc-o'late the error in from Honda is 68mpg... Instead of the bottom of average range I'm now right smack dab in the middle. No loss in performance at all, no weirdness or bad behavior what so ever... yet I'm really keen on seeing what happens when I'm in Oregon in July as they have non ethanol gas available instead of the 10% gasohol CA garbage that's available where I live.