How would you explain ‘speed’ in the context?
Frida kept her mouth closed for several kilometers, which improved her driving. Running through the speeds in the Roadster with the gear-shifter on the floor looked simple, compared to the Model T with its hand-grip levers for running the accelerator and clutch. Even so, Frida grinds the gears like a butcher. The Chevrolet even has a gauge showing the gasoline level, so you don’t have to guess when it’s running out. Sometimes César forgets and lets the Model T run so low he has to back it up a hill, to drain out the last of the fuel from the tank under the seat. That would be Frida’s style as well.
How would you explain ‘speed’ in the sentence: Running through the speeds in the Roadster…?
PS: It’s from The Lacuna by Kingsolver.