I thought Super unleaded was snake oil but after eight tanks of essos finest I'm driving more aggressively and getting 6-10% better fuel economy. I now do nearly 19mpg instead of bang on 17. That's according to fuel in / miles. The onboard computer still reckons I'm getting 22. Yet the tank range estimate is spot on?
Maybe it just needs to be thrashed regularly to clear it's throat? Who knows?
Bill
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"Man Math" - The means by which a caring husband convinces his wife that a 4.2 A8 is in fact cheaper to run than a tiny Auto crap box
"Being in touch with your feminine side" - The ability to, in the 30 seconds following a major accident, obtain your wifes approval for replacing your big german car with another "because otherwise we'd be dead".
See also sulking for two years until she finally allows you to get another purely on the basis of your current one being the wrong colour.
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