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I don't travel at 50 mph for fuel economy. I have always driven at 50 mph, even in my old Volvo automatic, where fuel economy was the last thing on my mind. Scotland's roads are twisty, undulating, and with no run off area, so you have to be ready for any eventualities. The max permitted speed on any two lane in the UK is 60 mph, and lorries over 7.5 tonnes are limited to a maximum speed of 40 mph in Scotland (with one exception - the A9) and 50 mph in the rest of the UK. There are great lengths of two lane where the limit is 50 for everyone and even a lot of dual carriageway and motorways have a 50 mph limit.
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