That's what it says on the inside of my fuel tank flap about tire pressure, but I don't know how long the car would last going that fast.

3000 RPM = 67 MPH
3500 RMP = 78 MPH
4000 RPM = 90 MPH

Didn't get a chance to take it to 100 mph that day. This is with the stock rear end and 205's on it. The speedo seems to be correct based on mile markers and the lovely "your speed is XX" signs all over town.

Where do you think "red line" is? I'd be more concerned about other things than my tire pressure if cruising at 100 for sustained periods of time.

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1983 300SD