Can a car go 300 mph?

It's theoretically possible, but no wheel driven car has yet done this. 403.10 MPH is the current record, and that was established in 1964. The ThrustSSC, which is turbofan powered and thrust propelled, holds the current land speed record at 760.343 MPH over a distance of one kilometer and 763.035 MPH over a distance of one mile.