Assuming the donation of the gift card was not previously recorded, enter it in Purchases: expensed to gas, then on the line below enter a negative amount to the donation account.  The total at the bottom right of the Purchases Journal should be zero

Thank you Carolyn! Yes, the gift card was not previously recorded. Since each card was used for a few purchases before it ran out (we received 2 gas cards and 1 Superstore card), I guess I should just enter a separate transaction for each amount purchased, each resulting in zero. And I'll record it under the Vendor names.

I was trying to think of keeping a running total since we might reload them, but that's too difficult :)