That's a bunch of BS. The book study merge didn't help to "save gas" (in our case at least) because it was on Sunday mornings for us, right before the field service meeting. After the merge, the field service meeting stayed, but the meeting didn't, so it didn't make a difference. I was really hoping that I could enjoy my Sunday mornings at home, but that was quickly shot down.
And besides, not everyone drives. But of course the WTS thinks that because they base everything off their American tendencies and culture.