The Ultimate MPG thread.

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Sep 23, 2016 | 12:25 AM

#811

scotty918

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Joined: Sep 2016

Posts: 28

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From: Tulsa, OK

Sep 23, 2016 | 02:47 PM

#812

lovemyboost

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Joined: Sep 2016

Posts: 397

Likes: 43

Quote:

Originally Posted by TheBigKahuna

Changed my original plugs recently, at over 100k miles! Guessing plugs were original, looked like it. On two of them the anodes were bent well beyond spec gap. So my low rpm shuddering in OD went away. But my average mpgs dropped from 13.5 to 12.7 for last two fillups. Same driving, haven't been pulling the boat, etc. Hmmm?

A larger gap increases mpg within certain limits. Your loss of MPG may be that the old plugs had an increased gap from wear? Try increasing your new plug gap.

Sep 23, 2016 | 05:47 PM

#813

EDDLG01

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Joined: Sep 2016

Posts: 33

Likes: 5

Quote:

Originally Posted by TheBigKahuna

There is a different gap on the 5.0 or Eco boost, I have a 5.0 and gap then at .045... I drove for 90 miles on the HWY at 65 MPH and it shows 18.2... I think if I go for a longer trip I probably will do the 19.+

Thanks

Sep 23, 2016 | 05:55 PM

#814

EDDLG01

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Joined: Sep 2016

Posts: 33

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Quote:

Originally Posted by scotty918

That's NICE... but that's because is NEW, I don't think there is anyone on a 4-5 year old truck will get that mileage maybe a 21MPH. I have a 5.0

Sep 23, 2016 | 06:29 PM

#815

scotty918

Junior Member

Joined: Sep 2016

Posts: 28

Likes: 1

From: Tulsa, OK

Quote:

Originally Posted by EDDLG01

That's NICE... but that's because is NEW, I don't think there is anyone on a 4-5 year old truck will get that mileage maybe a 21MPH. I have a 5.0

Here's what's crazy, my fuel economy is actually getting a little [I]better[I] as I continue to break in this truck.
Disclaimer: 2.7 ecoboost 4x2 (and I drive like a grandpa)

Sep 23, 2016 | 06:39 PM

#816

EDDLG01

Member

Joined: Sep 2016

Posts: 33

Likes: 5

Quote:

Originally Posted by scotty918

Here's what's crazy, my fuel economy is actually getting a little [I]better[I] as I continue to break in this truck.
Disclaimer: 2.7 ecoboost 4x2 (and I drive like a grandpa)

Well that's like a 3.0, I had a 96 Aerostar and I was getting 22MPH, I sold it last year and it only had 69K, I was the second owner. Newer cars are more fuel friendly this days compare to 10years ago. GOOD LUCK with your truck
THANKS

Sep 23, 2016 | 11:01 PM

#817

lovemyboost

Member

Joined: Sep 2016

Posts: 397

Likes: 43

Quote:

Originally Posted by EDDLG01

Thanks

This is not an area of expertise as to comparing plug gap specs on different engines. It is my recollection that the EB gap spec was made smaller which solved some issues. It wasn't advertised that this does decrease MPG.

Sep 23, 2016 | 11:33 PM

#818

TheBigKahuna

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Joined: Aug 2016

Posts: 30

Likes: 1

Quote:

Originally Posted by EDDLG01

Thanks

The plugs (Motorcraft) all came out of the boxes pregapped to spec. I'm not really interested in pulling them out and regapping them.

I am disappointed that new plugs dropped my already poor MPGs though.