125-200cc 09 WR 125 Fuel Milage

I had a friend of mine who is a 40B rider in HS and enduros run out of gas this weekend after 21 miles. We were riding the ISDE qualifier in Missouri so conditions were tight, technical, and muddy.

Is this possible? 21 miles? I was running my stock tank on my 08 CR 125 and had at least 1/3 of a tank after the 29 mile gas available.

Anything is possible and it happened! I haven't really checked mileage on my '09 yet, but was hoping for 40+ miles on the tank. I want a larger tank, so I'm confident to 50 miles. .7 gal less in his tank than yours. When they set the bike up, did they set float height and did he dial the jetting in after he broke it in or just running preferred settings from power up kit?

FWIW on my 09 TXC250 I seem to be getting more mileage out of the stock tank every ride,stretched 40 out of it today averaging 18MPH for the whole ride,I may drain the tank and see whats left! cant be much,may not need a big tank for the four stroke after all if I can get 45 out of it

I did a race this weekend on my 09 wr12 that I went into the reserve at about 34 miles. I finished the race on reserve. I want to drain the tank and see how close it was. The reserve lasted the last 5 miles.

Perhaps at some point the float became stuck open with all that water and mud, it's a definite possibility.

In the last 2 years of racing both a 2006 then a 2008 cr 125i always seem to get about 20 mpg