On Thu, 11 Apr 2019 15:56:24 -0700 (PDT), "
> wrote:

>On Thursday, April 11, 2019 at 4:51:58 PM UTC-5, dsi1 wrote:
>>
>> On Thursday, April 11, 2019 at 11:36:58 AM UTC-10, Sheldon wrote:
>> >
>> > Mine too, that is ever since the lower grades contain ethonol...
>> > ethonol mkes engines run rougher and gives poorer MPG.
>>
>> My guess is that the high octane gas also contain ethanol. It does lower your fuel mileage but the ethanol also suppressed engine knock which allowed me to use one grade lower of gasoline. I didn't notice my engines running rougher. Perhaps you had a potato stuck up your tailpipe.
>>
>Yes, the higher octane does contain ethanol.

Not where I live... says so on the pump... my vehical runs smoother
and I get 3 more miles per gallon with premium. Premium costs about
40¢ more a gallon but I think it's worth it, especially for a
smoother running engine. The owner's manual for my vehical says to
use regular but my vehical is a 1990, there was no ethanol back then.
My mechanic clued me in, he said no gas engine should be run with
ethanol, not even a lawnmower. He was right, I now use premium in my
push mower and it runs much better. I use premium in my 2 cycle
engines too and they run better and are much easier to start. Ethonal
is most definitely a gimmick that will cost you major maintenance
costs and having to replace prematurely,