Fuel

[Matt the boy]

Hi everyone just need a bit of advice currently running a 1.2 Grandland which is better for the engine Esso premium or Shell Premium looking to get most mpg out of it and has anyone experience drop in mpg with using E10? 

[Vauxhall Owners Club]

It is good that you are considering running on premium fuel as it does have a better calorific value that the E10 fuel which containing 10% Ethanol offers less performance per mile than a better quality higher octane rated fuel.

Since running my older car (but not bikes) on E5 it makes a huge difference on performance and MPG.
Not entirely sure what difference you will notice on a newer model like the Grandland but only one way to find out. 
When it comes to Shell and Esso I imagine they would be of similar quality but again its worth trialling each one to see the outcome