There could have easily be a secondary joke about staying above 55 mph....(which of course Shimakaze can't do).
STARTWell, that's not gonna happen! No breaks for me, no sir!bom...kishishiYou're so sloooooow, Turtlebari!If you don't speed it up, I'm gonna disappear!Ah-ha-ha!dmpdmpdmpdmdmpSloooow!
Sooo slooooow!Right on time.That Yuubari, I'm sure that she thinks that she's gonna make a turnaround by riding up in a car or something...