e10 vs 87 octane gas

[ding]

I'm sure this has been discussed before. But I was having hard time finding much on it. I've been using gas with out ethonal in it for my ski, been getting about 7200-7250 rpms. Yesterday I was nearly empty and filled up with e10, seeing I was filling up my suv, and I noticed all I was pulling was 7k on the dot. Top speed was a bit lower, ran good otherwise. Any thoughts on this, normal I would guess?

 

[jeepmiller09]

E10, sometimes called gasohol, is a fuel mixture of 10% anhydrous ethanol and 90% gasoline that can be used in the internal combustion engines of most modern automobiles and light-duty vehicles without need for any modification on the engine or fuel system. E10 blends are typically rated as 2 to 3 octane higher than regular gasoline and are approved for use in all new US automobiles.

To me it sounds like you need to have a new engine to have this work to its fullest. From reading this I would not fill up with E10. just my 2 cents.

Miller