Yes, outlet location is crucial. I pass an LPG outlet on my 40 mile trip to work, and there are two others only a few miles off the route.
Of course it depends on tank size. Mine has quite a small tank, so diversion costs have to be factored in. But with the biggest tank (65 litres), or even doubled up, diversions become more worthwhile.
But the question should be easily answered - if you could buy petrol at 80p a litre, would you drive 10 miles to fill up?
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