Question on breaking in new Elantra, Also wondering how MPG is calculated on the panel Options

[hello28]

Hello everyone,
Just bought my first Elantra yesterday. I had a few questions. I know before when I purchased a car they always said I should break it in slowly during the first 1000 miles: meaning not going faster than 55 or 60 MPH on the freeway, starting slowly, etc. Does that still hold true for today's cars like my new Elantra? If I go 70 on the freeway during the first 1000 miles is that detrimental to the car in some way?

Also, how is the MPG determined that's shown on the dashboard. Is this calculated between fill-ups, so the Avg MPG that displays is since the last time you filled up? Or is it based on just the last few miles or so?

Finally, on my Limited (automatic) I bought, they said to keep the eco button on (or whatever it's called, it's on the far left side on the driver's side). Has anyone noticed if this is helping with gas mileage or if having it on has any negative effects on the car?

thanks for your help!

This post has been edited by hello28: Sep 4 2011, 10:35 AM