It is interesting to note the difference between Sweden and the US as regards to prices and performance of unleaded AVGAS. Hjelmco AVGAS 91/96UL ® (basically an UL94 with better performance) which has been produced for 33 years and has during all the years sold at a LOWER price than 100 LL. Currently the UL price is approc 15 % lower in price than 100 LL. Also the Hjelmco fuel has never had the valve problems that experienced in the US with UL94. Google on search words to find more informationl