aren't the instructor and your kids aren't going, you can't claim it. You seriously make 4+ trips that aren't for personal worship to a church building that is 25 miles away each and every. single. week? That seems excessive.
The accountant I talked to even said that if you are in the Bishopric or YM/YW leader and have one of your children riding in the car, you can't claim it because it is personal worship for one of the riders in the car.