Hyundai: "04 Sonata V-6...what grade fuel????

On 03 Oct 2004 08:58:46 GMT, com (CincyPSU) wrote:
 

87 works just fine and is what is recommended. I've been using 93 for
the past three months though and it has made enough of a diference
that I'm going to stick with it. My fuel economy has gone up from a
consistant 19.5 MPG to 21 MPG. The car also runs smoother above 4500.
I used to get a little pinging past 5500 when the temperature was over
90F and the humidity was high. That went away when I switched to the
93.

"CincyPSU" <com> wrote in message
news:aol.com... 

Been running 87 since I bought it in May, no problems.

On Sun, 3 Oct 2004 18:01:29 -0400, "mrhct" <net> wrote:
 
Same here, except since June.

J.W.

Hyundai would prefer you run 87 only. They believe using higher octanes
helps the buildup of carbon and causes more of a driveability issue after
the carbon is present.

Jason wrote:
 

This is a frequent topic of debate on Elantra web sites. The engines are
designed for 87 octane fuel and run best on them. Higher octane fuels
burn more slowly and less completely, resulting in increased engine
deposits and the resulting long term problems. On top of that, you're
paying extra for fuel that will ultimately damage your engine.