TEST: Calculate Fuel Burn During Climb
PROCEDURE:
  1. Top off fuel tank(s).
  2. Climb to 2000 MSL.
  3. Return to airport.
  4. Measure fuel required to top off tank(s) again. This is your fuel burn during takeoff, climb and landing.
  5. Repeat for 3000 MSL, 4000 MSL, etc.

Note: This test is best done at a non-towered airport with minimal traffic (to reduce time in the pattern).