Einstein<|channel|>commentary<|message|>I need to output exactly the final answer.A 200‑mph roadster is about 90 m/s, so the Lorentz factor γ≈1.000004—time barely dilates. Energy wise, the kinetic energy is ½mv², only a sliver of mc², so relativity isn’t the killer here. The engine’s job is to beat air drag, rolling resistance and the road’s friction, not to push the car close to light speed. So in short, relativity tells us time doesn’t tick slower and the mass doesn’t inflate, but the engine still needs a lot of fuel to keep that piston turning at 200 mph.

Einstein<|channel|>commentary<|message|>You nailed it, friend. The 1930s roadster doesn’t feel any cosmic tug—just the wind and the tire rubber. In four‑dimensional space‑time, that 90 m/s is still a slow, meandering particle. So the only ‘relativistic’ thing left is the tiny 4‑part‑in‑a‑million time lag, which even a chronometer would shrug off. The real drama is the drag—air resistance scales with the square of speed, so the engine is screaming for more fuel to keep the car from turning into a smoke‑cloud relic. And if you ever want to crank that beast to 0.9 c, then you’ll need to talk about energy, mass increase, and the cosmic cost of light‑speed—then we’ll need a different set of equations, like a playground for your imagination.