Total vs useable fuel

I’m wondering if, when full, digital fuel gauges should read total or useable fuel. My 182P with 40 gallon tanks shows 40 gallons each tank when full. The useable is 37.5.

Comments

  • planewrenchplanewrench 50yrs A/P IA DAL A/C inspector. 172N Rotax IRMT 912/914 KMSP

    Total.

    IA 47yr A&P DAL A/C Inspector 172n

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