Hi!

I hope you are well.

In Norway E10 is implemented in 95 RON fuel. 98 RON is still non ethanol.

Some people recommend to use 98 RON to get better fuel economy and potentially more horsepower.

I will check it out this summer. I have a Mercury 450R, and wonder if 98 RON is the hot ticket to less fuel and more speed

Cheeers Toffen

I wouldn't run the E10 in a marine engine if you don't need to.
The 98 RON is equivalent to our 93 Octane and 95 RON is equivalent to our 91 Octane.
It is not likely that you will make any more power or get better mpg though.

Bevare if you don't have a stainless steel fuel tank, my integrated polyester tank dissolved when E10 95 was implemented here in Sweden.

Increasing Octane doesnt make horsepower or better fuel mileage, only less detonation potential.

Dan,

Doesn't this allow for strives for more HP, though? I completely agree that octane isn't "pour-in horsepower", but it DOES allow for things like compression, boost, valve timing, etc. to be changed that DO result in more HP. Right?

Thanks. Brad.

Does the 450 adjust boost or timing for different octanes/ detonation?

Of course but the OP stated he`s heard if he pours in higher octane fuel it will give him HP and better fuel economy which is completely false.
(unless he`s using lower than recommended octane currently)

Dan,

Agreed. I kind of laughed at that, too. Just wanted to clarify. All good.

Thanks. Brad.

Hi!

I think the point is not octane, bud ethanol or not. In 95 RON its 10%, in 98 RON its zero. Some people say you get better milage with non ethanol fuel, that offset hight price for the 98 RON

Cheers Toffen

whats the price difference 95 vs 98 ?