It depends on the car though, I haven't driven a 1.0L Fiesta but it looks like its gears are so long that 4th is almost like 5th in other cars.
I drive a red edition and that's what I commented on, I should have been clearer. I do a couple of miles at 30mph as part of my daily drive.
Your right about the gearing. Let it slip a few mph below 30 in 4th and its labouring.
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