I never heard fuel leak problems.
If you think loosing fuel because to did only few miles before 'reserve' light coming in, you can do is :
- fill in your tank 100% ;
- set daily counter to zero ;
- run until empty tank ;
- check real miles done with the full tank.
I did it myself : 247 km = 153 miles
I don't always trust the fuel display, I prefer tke km one
2014 KTM EXC450 6Days
2008 HP2/MM ABS
2005 HP2E SM Prototype