Originally Posted by Poly
You will probably find interpreting the answers rather confusing, as there is a strong UK bias to the forum where regular petrol (gasoline) is 95ron anyway. Very few people will be running 98 Ron here in a boat (hard to get and expensive). And if I remember correctly there are different international standards for Ron anyway!
I've never seen a choice for ethanol content in fuel in UK. I *think* forecourt fuel here can have 5%.
In the United States, we use (RON+MON) divided by 2 to find an average.
Typically averages to 87, 89, and 91...so about RON 93,95, and 97. There's a local gas station that sells 0% ethanol RON 97. I typically use that for boat fuel. Cost last week was $2.97/gallon, so about 0.52 GBP / liter.
For my little boat:
- 1966 Johnson 9.5 hp
- 30 micron inline fuel filter
- 97 RON, 0% ethanol
I fill my boat tank through a "Mr. Funnel" water separating funnel.