Jersey price is 91.7p per litre this month.
If you are planning a trip abroad from UK, you can uplift the fuel in the UK ,VAT free and also get 28.1p per litre drawback on the dutypaid. So if you are paying £1.30 VAT paid normally, you should only pay around £1.08 VAT free and less 28.1p = 80p per litre. so the Channel Islands prices are actually in real terms 10p a litre more expensive. Unfortunately most GA airfields will not sell you fuel VAT free, you have to uplift from larger airfields who understand the system but then you pay the increased landing fees, swings and roundabouts come into the frame here.