75mpg is possible in a euro3 163bhp S60 D5 manual on a long run , it would need the right road conditions and the driver using the techniques on the hypermiling sites . Driving this way on a long journey can be extremely boring and there is a need to avoid causing incovenience to other road users who do not expect to get stuck behind someone cruising at 47mph . Most of my journeys are approx 1000 miles over two or three days and in 'real world' driving I have to be in certain places at a specific time which often buggers up my plans to achieve a high mpg. Wether or not its worth the effort depends on your income , a journey from Liverpool to Glasgow at 43 mpg will cost me approx £32.25 for diesel and take 3 hours , at 60mpg it will take over 4 hours but cost £9.12 less . For many drivers I can understand this saving is just not worth the extra time it takes .
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