Yes..for the first few times then once i know full tank range then its back to "res' all the time...its only 3 gallons so maybe 120 miles tank range?Hold on there.. try this. At fill up reset your trip meter to 0 . Run with the petcock “on” until the engine sputters lacking fuel. Note the miles traveled. Switch the petcocks to “res” for additional run distance, go for fuel.
Sound reasonable ?
-R