Is it her church? If it is, drop the kids at her house on Saturday and let her take them, then you can pick them up on Sunday when you are recovering from your hot, kids-free date with your wife on Saturday night. Grandma gets to see kids....kids get to be spoiled by grandma....wife and Lemur can play Total War or LFD2 and relax in a quiet house.....I think that's worth some gas. And if you are really worried about the drive time and the gas, then don't actually go home, you and the wife go get a hotel somewhere and trash the room.