I've had many Peugeot diesels over the years (205, 206, at least four 306s, 307, 407) and I do agree, some don't like supermarket fuel. The old 306 would burn anything you put into it, but the 2007 307 and the 2006 407 I owned felt flat and lifeless on supermarket fuel. And a few other 407 owners have said the same.
But, its all down to personal experience and very unscientific because no two journeys can ever be the same, due to traffic, temperature and even the way the driver behaves.
I'm quite lucky in my area because Shell fuel is within a penny or two of supermarket fuel prices, and they're actually on my driving route, I'd be going out of my way to a supermarket.
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