Fuel computer under reading
Last week I did some training for night rating flying more than 4 hours on the tanks. After refuelling I find out that:
- the amount of fuel on the bill was 146.36 litres = 38,67 US Gal
- the indication on G1000 of my C172 was GAL USED: 34.6
The difference is 11.7% on the dangerous side, because the gauge is under reading.
Normally I fill the tanks full and set the fuel computer 3 gallons less (to 50 gal instead of 53) just in case... For me it looks like to set the computer to 53-11.7%=46 USG is the "first aid treatment" for this problem. Would be better to find a real solution. Ideas? Is the gauge adjustable?
Do you have similar experience?
Miroc