pa22 - three tanks totaling 160 litres.
Average fuel burn 30 to 31 litres (160 hp), long flights as low as 26.
Burn from the right hand main until the reserve can be transfered to it. Switch tanks around every 30 minutes once the reserve is empty, but use the right tank twice as much as the left.
The right tank is placarded against takeoff and landing when less than 50%.
The gauges are useless - if they more there is some fuel in the tanks!
Calibrated wooden dipstick lives in the luggage. Visual checks only tell you if it's full or there is 'something' in it. We only use full tanks on long trips due to the effect the weight has on strip performance.
It's pretty easy so long as you know how much is in it and remember to use fuel in the correct order. Thankfully there are no c of g issues with fuel.