Pudding Guy Wannabee,
You still have some work to do. I believe that the orignal Pudding Guy spent something like 1/7th the cost per mile as you did (give or take)? You did very well, but this is not a screaming deal. I'd rather spend a little more money per mile and go on a mileage run and visit a new city. Though with some of the current internet fares you can potentially pay less per mile on a mileage run.
Despite that, your generosity to local charities is heartening, and I hope that more people follow your example.