Good afternoon, this has probably been asked before but, i have a 2019 1.2 lounge which we have had for 3 year's it has always returned around 41 MGP around town and run it on E10 petrol but 2 weeks go we decided to try it on the E5 fuel as it is said to be better but the MPG has dropped to around 35 we have used that tank of fuel and gone back to E10 but have had no improvement. Can anyone give me any clue what to look at to improve things. Thanks for any help you could give. Kevin