open up the tank and see lor ... hmmm u can try to clock your
total distance that one tank can travel how much km meaning u pump
full tank the reset trip meter then at the time u on reserve check
the trip meter ... example 200 km ...mean that youcan travel 200km
without having to on reserve so u can go pump at ard 190km to play
safe lor 
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wish u good luck
wish u bad luck
wish u born a baby duck