When I did my snorkels this week I ditched the champion OEM plugs (still looked good btw) for a set of NGK BKR7EIX (iridiums). My 800 has a k&n air filter & triangle Atv snorkit but otherwise stock. Was averaging around 27-30 miles per tank until the fuel light flashed (terrible). First thing I noticed was a smoother idle. Especially when cold. We ride fast paced and my bikes stays around 4500rpm a lot. Filled her up with 87 yesterday (always use top tier gas) and rode around in the snow & water for a few hours yesterday. Same riding style/pace & warm up time as usual. Trip says almost 20 miles and all the bars are still black. Buddy of mine with an 06 700 swapped to the same plugs a few weeks ago with the same results. Hope this helps some of you like it did us!