Robinson automotive gasoline approvals: Use of automotive gasoline is approved by the FAA and by EASA by STCs:
Robinson R22 HP, Alpha, Beta, Beta II, Mariner, Robinson R44 Astro, Clipper, Raven I. The R44 also is approved for UL91 fuel. For Robinson products, the minimum octane is 91 (RON + MON/2). All fuels must meet ASTM Specification D-439 for leaded fuel or D-4814 for unleaded. Fuel containing alcohol is not approved, nor is E-85 fuel at this time. EUROPE: EN228 was found to be substantially similar to D-4814. A great many STCs have been sold in every country in Europe and now increasingly in Eastern Europe.
The AS-350B2 allows the use of automotive gasoline as a replacement fuel with the following restrictions:
1. The use of gasoline is limited to 25 hours maximum between engine overhauls.
2. Requires adding 2% mineral lubricating oil if possible.
3. Maximum pressure altitude of 1500 ft and fuel temperature 30°C.