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-   -   2019 GT and Break-In MPG (https://www.fuelly.com/forums/f6/2019-gt-and-break-in-mpg-20311.html)

collegekid 11-09-2018 09:07 AM

2019 GT and Break-In MPG
 
I've been on Fuelly for a while with a few different older vehicles, but this is my first new one. I'm surprised at how efficient V8 engines have become. My 88 5.0 was 20 mpg average if I drove like a granny, and I can get almost 24 with double the hp on my 19.
I use regular unleaded and drive it like a maniac half the time.

Since this is my first new car, I wonder about something a mechanic friend told me. After your car breaks in (usually about 10k miles) your mpg will drop noticeably. Is this true? The mpg I'm getting now is great and I would hate for it to start dropping.

trollbait 11-09-2018 11:43 AM

Fuel economy gets better once the tires have a few thousand miles of wear on them.

Draigflag 11-11-2018 12:58 AM

I always thought the opposite, think of anything new, they all require more energy to move them due to the resistance of new parts. A brand new book is harder to open than a 1 year old one, and freshly fitted door handle needs more energy to push it down, but when things are "worn in" they require less energy. I assume its the same with cars with many thousands of moving parts.

collegekid 11-16-2018 05:21 AM

Makes sense! My gas mileage improved slightly after my second fillup, and seems to be holding steady now as I edge toward 3k miles.

rfruth 11-20-2018 10:23 AM

Green Lightning indeed ! (drool goes here)

Draigflag 11-20-2018 11:08 PM

Ford's modern engines are surprisingly effecient if you want them to be. In the 2016 MPG marathon, the Mustang V8 won best percentage difference getting 36 UK mpg overall. Last year, Fords fiesta came first in both petrol and diesel getting an incredible 97 mpg and 122 mpg respectively!

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if you want them to be. In the 2016 MPG marathon, the Mustang V8 won best percentage


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