E5 or E10 Petrol

Thank you all for your comments.
Appreciated

I only put Esso E5 in my G4, it is a few chassis numbers after the fuel pump recall (which is rumoured to be because they used home market fuel pumps = zero ethanol, rather than Euro ones) and I don't do enough miles for the extra cost to be significant. Esso E5 is supposed to be zero ethanol.

The Other Car gets Tesco e5 (Momentum) it is only a few pence more than the E10, and most of that will be offset by higher mpg.

I'm with Scimike, as a low mileage user I don't want stale E10 in my tank.

 

I got far less power (needed lower gears up every hill) in a Mazda CX-5 on E10. It didn't like it at all. Maybe if it had had a few tanks in succession, it would have calibrated itself.

Similarly, I have always had much lower mpg (10%) in Japanese cars from supermarket petrol. It didn't seem to bother European cars. There isn't any difference apart from a few additives, so this was surprising.

I stick to E5 except in emergencies, but I don't do a high mileage and fuel costs are small compared to eveything else associated with running a car.