Just done a 600-mile outing this weekend - mainly a mixture of M-way and A roads, taking no special care to be economical (plenty of foot-to-floor overtaking to make reasonable progress in E Sussex in particular, where time for many people seems to have slowed to an intolerable standstill...). Started with full tank, and filled up again after 455 miles when the gauge showed 45 miles left and started flashing at me. About 37mpg at 45mph average. Info centre agrees and seems to be accurate.
If my info centre is to be believed, about 50mpg could be achieved on cruise control at a steady 50mph. Slowing down really does help, as all the advice says - it's simple aerodynamics. That said, slowing down is no substitute for having a diesel if this is what you care about. I achieved an easy 44mpg average last week in a borrowed V70 2.5D with 220k miles on, taking even less trouble to be economical...
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(Formerly) 1988 745 B230K (Phoenix)
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