How fast should I drive my Toyota Yaris on the motorway?

I have a Toyota Yaris 1.0-litre petrol. Could you tell me what is the best rpm to shift gear? Also is 50mph or 55mph the optimum on a motorway?

Asked on 9 February 2013 by GS, via email;

Answered by Honest John
I was driving one of these over Christmas and I changed up at about 3000rpm. You can't drive at 50mph or 55mph on a motorway or you'll get stuffed by an HGV. 60mph is the minimum safe speed for cars on a motorway.
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