Does Supermarket Fuel Produce Lower MPG?

[TheBALDpuma]

TREMAiNE said:

TheBALDpuma said:

TREMAiNE said:

I get the best MPG out of Tesco Momentum.

The 5% additional cost returns me a 25% improvement in MPG.

Even if your car is set to run on 97+ I doubt you can actually get a 25% improvement from super. So you go from say 40 to 50mpg from reg to super unleaded? I just don't believe that's possible.

I've spent months testing and I'm 100% positive these are the gains I receive.

I average 16mpg with regular and 20mpg with Super, even now that I'm sure, I still alternate what I put in each time, just to triple check my already conclusive results.

At the lower (rx8 end) of the econemy scale the numbers do add up better I suppose, and I also assume it's supposed to run on super rather than RON 95?