There's no reason why any of the 75s, or any car for that matter, shouldn't be able to cruise at high speed for long periods of time - provided the engine is not revving its 'nads off and the cooling system is up to the job (this is where your sludged up radiator with the fins rotting off will get you!) there should be no issues. Of course, there's plenty of cars where it'd be so noisy and uncivilised that you wouldn't want to for more than a few minutes, but that's not a reliability issue.
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