I bought a TT One XL at Asda for £145. To cover a journey between Ipswich and Dundee, it routed A14, M6, M74, A80, A9 and A90 a total of 522 miles taking 8 hours 39 mins.
Without navigation, I used A14, A1, A66, M74, A80, A9 and A90 a total of 470 miles and it takes 8 hours.
Did I make any mistakes, supporters of TT?