I know this is a bit off topic but could help someone with plug fouling. I was using the Extreme in my 22 850 since new and the sled had the plug fouling only on the first startup of the day if the sled was parked outside. A dealer told me to try using the VES. At about 500km I drained the tank and switched to the VES. Is it coincidence or what but I haven't fouled a plug since. Im going to give it a few more mountain trips and a couple more litres of the VES to use up before im convinced. Will be switching back to the Extreme to see if the fouling comes back.