2019 GT and Break-In MPG - Fuelly Forums

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Old 11-09-2018, 10:07 AM   #1
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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.

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Old 11-09-2018, 12:43 PM   #2
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Fuel economy gets better once the tires have a few thousand miles of wear on them.

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Old 11-11-2018, 01:58 AM   #3
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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.
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2019, ford, mustang

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