1. Man, he's as slow as Christmas! (do you use this simile?)
2. Would you stop being a backseat driver? I don't need you to teach me how to drive.
3. The car behind us really annoys me. I don't know why the driver keeps blowing the horn.
4. Give me a break! Can he drive or not? I wonder how he got his driver's license.
5. Why is he tailgating us?
6. I'm almost out of gas. Do you know where the nearest gas station is?
7. Fill it up. Unleaded, please.
8. Let's go for a ride. / Let's take a road trip.
9. Sit tight. I'm gonna floor it!
10. I have to slow it down a little bit. I know that there are some speed traps in this area.