The Definitive Ecoboost vs GT gas mileage thread

[ChaoticFury09]

Good morning everyone,

I know this question gets asked a lot and I had been holding off posting anything. As someone who owned a 2018 Ecoboost and now owns a 2019 GT I think I might be able to help a lot of people with real data. I love collecting data so I have every fuel-up I have had in every car logged for the most accurate results possible.

My commute has remained the same over the course of the data logging and I even took the same trip at the same time of year. I travel from Toronto to Chicago every November for Thanksgiving. Both cars have completed that trip and were used to drive me to and from work, along with weekend errands etc. I live in the city of Toronto so the vast majority of my driving is in the city. You could estimate 75% city and 25% highway. The only thing to keep in my mind is I had my Ecoboost for about a year and my GT is getting to six months in a few days but it should be pretty accurate.

• Both cars were filled with either 91 or 93 based on what was available.
  
• The Ecoboost was given the Ford Performance Tune in the last three months of my ownership.
  
• The GT has been driven more (it's objectively more fun for me) and driven slightly harder

Long story short:

• The Ecoboost has better efficiency in the city by approximately 2-3 litres per 100km. Based on my driving habits.
  
• The GT and Ecoboost are very similar on the highway but the Ecoboost is slightly more efficient by 1-2 litres per 100km.
• You will need to fill up the GT more often depending on your driving (highway vs city, etc.)

Here is the data for anyone interested.

Ecoboost

• 32 Total Fill-ups
• 8.1 Litres/100KM is the best efficiency I achieved with the car (29 MPG)
• 12,817.6 Total KM's (7964.4 Miles)
• Average cost per KM $.0142 ($0.228 cost per Mile)

GT

• 20 Total Fill-ups
• 9.2 Litres/100KM is the best efficiency I achieved with the car (25.5 MPG)
• 7,296.5 Total KM's (4,533.8 Miles)
• Average cost per KM $0.181 ($0.291 cost per Mile)

Feel free to ask any questions you might have, but I hope someone finds this helpful.

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[ChaoticFury09]

You left out SPG, which is probably the most important measure of a car's efficiency. Could you post those figures please?

While both cars unequivocally provide many SPG's the GT provides about 30% to 50% more.

 

[Rock&Roll]

2700 miles New York to Florida and then Florida to New York

I averaged 28.5 mpg in my GT

 

[lacanteen]

I have never reset this screen and the car had 150 miles on it when I purchased. Take it for whatever it's worth. If you divide the miles by the time the average speed is 38.41 MPH. My .02

 

[gmupatriot]

I don't know how you guys are getting such great MPG on our GT's. I am lucky to get 20MPG on highway. This is a 2018 GT with A10 and 3.55 rear. For the first 10-12 thousand miles, I would average 25-26 MPG but it has dropped down to 20 MPG with 29,000 miles on the ODO. I have always changed the oil myself, air filter, the tires are properly inflated to 34PSI all around. I wonder what is wrong :/

 

[FreePenguin]

Maybe clean mass air flow sensor

 

[Silver Bullitt]

I don't know how you guys are getting such great MPG on our GT's. I am lucky to get 20MPG on highway. This is a 2018 GT with A10 and 3.55 rear. For the first 10-12 thousand miles, I would average 25-26 MPG but it has dropped down to 20 MPG with 29,000 miles on the ODO. I have always changed the oil myself, air filter, the tires are properly inflated to 34PSI all around. I wonder what is wrong :/

I log all my fill ups. They have to drive like old women to get mileage like that or only drive downhill with a tailwind. Best tank I've ever gotten in 10K miles on my 2018 GT M6 is 20.6 (22.3 per the liar). Worst has been 16.3 (17.7 per the liar). I do typically drive my car rather spiritedly though.

 

[ChaoticFury09]

I log all my fill ups. They have to drive like old women to get mileage like that or only drive downhill with a tailwind. Best tank I've ever gotten in 10K miles on my 2018 GT M6 is 20.6 (22.3 per the liar). Worst has been 16.3 (17.7 per the liar). I do typically drive my car rather spiritedly though.

Sounds like pretty aggressive driving. There is only so much space to have fun when cutting through Michigan. I was under radar guns at least eight times on my way there.

 

[ChaoticFury09]

I don't know how you guys are getting such great MPG on our GT's. I am lucky to get 20MPG on highway. This is a 2018 GT with A10 and 3.55 rear. For the first 10-12 thousand miles, I would average 25-26 MPG but it has dropped down to 20 MPG with 29,000 miles on the ODO. I have always changed the oil myself, air filter, the tires are properly inflated to 34PSI all around. I wonder what is wrong :/

Not sure either. Cold pressure says 32 but I doubt 2 extra PSI would make that much of a difference for you. As I get further along I can always keep this updated. I have awhile to go before 29,000 miles.

 

[Rock&Roll]

I don't know how you guys are getting such great MPG on our GT's. I am lucky to get 20MPG on highway. This is a 2018 GT with A10 and 3.55 rear. For the first 10-12 thousand miles, I would average 25-26 MPG but it has dropped down to 20 MPG with 29,000 miles on the ODO. I have always changed the oil myself, air filter, the tires are properly inflated to 34PSI all around. I wonder what is wrong :/

Yeah I dunno

For comparison I've got a 6 speed manual with 3.31 gears and I use premium gas.
28.5 mpg is pretty good for a V8. It's always around that on a trip.

 

[bluebeastsrt]

This should make the EB crowd very happy. I’m picking the EB to win this one.

 

[FreePenguin]

Honestly, even stomping eb everywhere when I do, still the lowest I can get is 20mpg.
Really cannot beat that, and I get sams club fuel, which is like 90c less than the other places.

I just toss some seafoam in every once in awhile

 

[Interceptor]

Traded a 2017 manual ecoboost with 36k, the all time average was 28.7 mpg.
My 2019 GT a10 seems to have mellowed out at 23.4 mpg, with same driving habits.

I miss my eco manual, it was more fun to drive. The GT is actually too fast to have fun with.

 

[UserName]

My lifetime average is 13.1 mpg. Gets down under 10 in city driving and 21-22 on the highway.

 

[bluebeastsrt]

Nah, I'm going to find a big mountain and cost down it with a tailwind. Post a 40 mpg average.

And this is why W3rkn hates you. You just refuse to let him have a win.

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