er... well, consumption depends on certain factors...
pressure of tyres, riding style, pipe/level of
restriction/jettings, the "terrain" you ride on, pillion or not...
yada yada...
to cut the story short, i got a friend who rode one... "racer"
types.. fully derestricted, properly jetted... averages about 180km
for a full tank... i'm not sure about the fuel capacity about the
mito, so can't give you a good figure. from my planet, i get about
21-22km/litre.
eh... your problem with the fuel and oil bulbs are prob caused by
blown bulbs. don't be mistaken, those indicator lights are not
LEDs, just plain bulbs. buy a replacement, and replace them. oughta
solve your problem. i've had that before, simple change of bulbs
solved the problem. oh yesh, don't trust your low fuel warning
light so much, if it fails on you without your knowledge.. you
could find yourself in unfriendly terrain with no fuel... pretty
siong to push your mito 5km to a petrol station man... your
indicator cables are numbered, so don't worry about putting them
back incorrectly... don't pluck out all just to be safe, one at a
time...
do this:
1. pump a full tank...
2. reset your tripmeter..
3. go ride as usual...
4. when you feel the fuel tank half empty or after like 3 days...
fill full tank again, and NOTE the amount of petrol you pump
in.
that's the amount of petrol your bike used (since the last top-up),
to travel the distance shown on the tripmeter. do a rough
calculation, like how many km/litre your bike does. do this
calculation a few times, to get an average. now with this average,
check out the capacity of your fuel tank... i think you should be
able to calculate the distance your bike can travel on a full
tank... and please do use the tripmeter as a gauge in future,
because our bikes have no reserve. and if the light fails without
your knowledge, very dangerous... you know what i'm driving at
la... hope this helps. oh and also reset your tripmeter each time
you pump full tank yeah? if not no point calculating all that
yeah?? 
