The difference in cost between 40 and 50mpg over an average 12,000 mile year is maybe £150.
Not worth worrying about.
Couldn't resist the calculation: £286 @ £1.05/litre, still not a gamechanger...
Oh. Well, you'd only need to bilk a few tanks to make up the difference.
@Colin_the_Bald started
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The difference in cost between 40 and 50mpg over an average 12,000 mile year is maybe £150.
Not worth worrying about.