I hade the shock of my life when I switched from morrisons unleaded returning 28 mpg on a 14 mile trip to work and back, cc set to 2.5k.
Then tried bp ultimate and same conditions returned 44 mpg.
I only put £30 in each fill up but when I filled at bp the first time I only put £20 in.
To say I was amazed at the difference is an understatement.
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