FE/FC How many km from tank of fuel on 501?

I had full tank on sudnay and bike ran out at 101km. I was sure it would have gotten 120km.
riding was a lot of single and ecu has been remapped

I've gotten as little as 100km before the low fuel light came on.
So...
Just last night I fitted this!

Seems a lot for a 501.
I never had the fuel light on so I don't really look at it much as mostly I have plenty of fuel left compared to other bikes in the ride.

I know. I read here about all this fantastic mileage people are getting, and my buddy on his '14 500exc gets about 45-50mpg but I seem to be averaging 35-38 mpg so far. Granted, I've only got 22 hours on the bike, and it should get better, but still.

From my guessing, I get about the same if not slightly better than your buddy on the KTM. And it didn't take much running in to get there, it's basically always been this economic.
At 22hrs they are run in and loosened up so if it stays this high I would look in to it.
It's part of the reason why I don't really know what the fuel consumption is as I never have to worry about it.
I run standard EU map, a few holes in the airbox cover, the 2 stroke airfilter cage (no mesh) and the cone crap and flame arrester we get in the EU type exhaust here removed, that's basically it.

Done a short ride the other day. About 12km each way on the road (100km/h speed almost all the way) and the rest of the 94 km off road with a mix of slow and faster pace. Hot conditions of about 32C.
Tank was filled and odo reset when I left.
When I returned I took these 2 pictures, the level on the tank is had to see but I put a little line on the pic.
I used about 1/3rd of the tank so all up I can probably do close to 300km on a tank.

I agree these bikes get good mileage but 300km on a stock tank is wishful thinking. Maybe and a big maybe is 200km on the road.

I've only got about 6hours on my 15 fe501 but im at 90 miles and still have a little under 1/4 tank.

Ride ya loop twice BS for scientific research reasons(c how much left after 2 laps 188km)!

Think you'll find tank holds lot less in wings than up top. Looks full but thin in that area

I have to agree here. I had the tank off to do the valves and like you say it's deceiving. The top contains the most fuel.
So yes, my guestimate was very optimistic.
I'll fill it up measured one of these days and give a more accurate estimate.
I'm of now eating that humble pie that I saved for a day like this.....

Mmmm pie

Nice Tank! Even with it counter rotated it is a better pic than even what Aceribis. I bought the IMS. 3.2g. I could use a little more now I know how it will look on my bike.

I have ran out after 101km's before. Long push home....

The most accurate way to measure your fuel usage is to fill it up, ride and then measure how much you PUT IN at the bowser or fuel container. Impossible to get a very accurate guess from a weird geometrical shape like those fuel tanks . Then use that number to divide by your milage. More pie mate, I reckon the number would be more like 150km tops :P

Always more pie...
I did 110 km the other day and there was a fair bit left. It was a slow ride as I was on my own and didn't want to do anything stupid.
Found some nice tracks.