the dog boarding is a cost we only have if we fly. We take the dogs if we drive.
But honestly, your math is about the same as mine. We have a friend to stay with 1 night each way, but the hotels I priced out were just under $1000,
AAA estimates my gas at around $500.
So the cost of driving vs flying is comparable. Driving is going to be a bit more expensive, but we also get more vacation out of it. We will spend more on food than we would if we were home those days, so that is a factor. Budget isn't really the concern here TBQH, I just thought we might get more enjoyment out of the same dollars by driving.