Fuel.grade?

[missmouse]

What kind of performance drop can I expect if I have yo refill with regular fuel?
2019 Cupra 290

 

[Mr Mustard]

I am half way through testing for any difference over multiple tanks (brim to brim, not using car's fuel computer) of each in my 2019 Cupra.

Also testing with Dragy for any difference in 30 to 70 times.

By no means scientific, but will be interesting to see if any difference.

 

[redone]

ecu learns the fuel grade over a number of cycles/tanks. also fuel batches are not consistent, even when supplier and grade are.

have a local tesco so just put momentum in. 5% seems a reasonable guesstimate.