Almost out of gas

Yesterday I left for work when the boys were still sleep. Shawn was in charge of dropping them off at Kindercare and I was going to be home in time to pick them up. That afternoon, when I picked them up, Tyler announced that they almost ran out of gas. Well random conversations come up frequently at pick up but why is it significant for Tyler and Gavin both to be jumping up and down in front of me telling me they "Almost ran out of gas.?" So I probed a little and then got, "Yeah and so we watched TV with A.J." A.J. is our next door neighbor. I began filling in the gaps and asking some questions.

Me: Did you run out of gas, or did you almost run out of gas?
T&G: We almost ran out of gas. Daddy said we might and we did!
Me: Where?
T&G: Well we were near where we walk when we go to the Clubhouse. Then we got out of Daddy's truck and walked home!
Me: By the Clubhouse? When you walked home did A.J. come over?
T&G: Well, we got home and Daddy turned on the TV and then A.J. came over. He said Daddy had to go get some gas.
Me: Did you get to school late?
T&G: Well, when I got to school, Roger said "You're late, Tyler!"