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I tend to set cruise control to 75mph and my journey is 150 miles return, about 100 miles motorway and remainder relatively quiet A roads and I only get about 51mpg. The motorway is pretty quiet an I mostly never need to come off cruise control. I don't have AC on. I have a 118d M Sport Auto. The mpg doesn't seem to change noticeably between 18" or 16" tyres. On the A roads I use Eco Pro mode on motorways I have tried both Eco Pro and Comfort, neither makes much of a difference. I am not heavy on the accelerator or the brakes, the tyre pressure is spot on and still I don't get anywhere near the expected mpg. :-(
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