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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