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If the wife bought "branded fuel" instead of supermaket fuel it would cost her between about £35 a year assuming there is a 4p per litre difference. If I thought for one minute that she would get better mpg and a better running car I would ensure she bought it. We buy Kellogs Allbran because the Tesco one tastes like chip board and at a £1 a box extra that equates to about £50 a year.
But the simple answer is the car runs no different on Tescos fuel (Asda, Morrisons or Sainsburys as well of course). I log every gallon we buy for all 3 of our cars and other than the mpg differences you expect when you go on holiday or the weather is freezing there is no noticable difference between any of the supermarket brands or "top" brands.
Every fill up returns a slightly different result of course but that is not down to where I bought the fuel from, its simply a result of the fact that you can never drive exactly the same on any 2 tank fulls, its impossible unless you are at a test track or in a lab.
The best tank fill mpg we have ever had on the wifes car was 57 mpg using a brand called TorQ. The worst was 41.6 on Asda. Does that mean that TorQ give 37% better mpg than Asda, of course not. The 57 mpg on TopQ was achived on a tank full that included a 430 mile trip of which 350 was on dual carriageways and motorways with 80 on good A roads, there were no hold ups. The 41.6 mpg from Asda was achieved on a tank that include 2 weeks of crawling about on ice covered roads with temps down to -14 degrees.
The "average" mpg for a tank using the car mostly for the wifes commute is between 49 and 52 mpg but again no two weeks are the same, the M1 runs freely some weeks, others its a car park. Some weeks she visits her mother which is an 80 mile round trip and that improves the mpg.
Sorry, but its impossible for the average motorist to determine if there is any difference between brands.
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