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Has anyone got an answer to this little one?
I have a 2000 Laguna Alize 1.6.
I want to try and find out at what speed (motorway driving) is it the most fuel efficient.
I had assumed that maybe 56mph was the answer as it is always quoted in tests, but I'm not so sure. As I am now doing a lot more motorway driving I want to know what difference in economy I woud get by driving at a steady 70mph and say, 60mph, or the 'mystery speed'.
Any comments welcome.