Super unleaded vs standard unleaded

[mcmaddy]

So far my findings are as follows.

Long term average on E10 in mixed drivng 32.5mpg

The average of the last few days doing the same journeys on E0 Esso 28.2mpg

So the E0 might actually be worse.

I cannot detect any difference in performance on my car.

is this the first tank you're using?

[symonh2000]

Yes the first tank.

I know some say that it takes a couple of tanks for the car to adjust, but considering that the fuel is meant to have a higher energy content I would have thought it would have made some difference straight away. I am also still way off needing to fill up again, so cannot do a proper calculation until then.

[SRGTD]

It’ll be very difficult to do an objective mpg comparison test for E10 v’s E0 fuels - especially after just one tankful of E0 as there’ll be many potential variables that could influence the results - e.g.

• weather conditions
• distance over which mpg was calculated for each fuel type
• routes travelled and the traffic volume
• speed
• tyre pressures
• whether or not stop start is used
• number of cold starts, gear changes, brake applications
• number / weight of passengers and their luggage in the car
• same driver or different drivers / different driving styles used

There’ll no doubt be others too.

[Rudedog]

I thought high ethanol fuels had more stored power? that's why cars wanting a very high output use it - dragsters

The ethanol is not good for engines kept in storage or low usage due to it's water absorption characteristics i.e. lawnmowers.

Higher octane is better for anti-knock and therefore re-mapped cars.

In my observations I most certainly get slightly better mpg with SUL that when I ran for a week on the E10 during the shortage.