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Discussion Starter · #1 ·
Hey guys, as you may recall, I purchased a 2017 Mustang EcoBoost almost two weeks ago. Today I went on a 400 mile road trip, all freeway, with an average speed of 65 mph, on cruise control, and I am using 91 octane fuel (the best you can get here in California), I topped out at 28.7 MPG's. Thus I am curious as to what the actual MPG's are people around the county (world) are actually getting out of their 2015-2017 Mustang EcoBoost (and heck, GT's too).
 

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The last tank I averaged 20 mpg - I drive 50 miles round trip on weekdays and it’s full pedal to the floor on weekend as I zip around town.

This morning I used cruise control and it seems to really help mpg.

I also think the top down has an impact on mpg.
 

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I’m always at 25.
I drive mostly highway; 60 miles each way from home to work and vs versa.


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I bought my 2016 new. A larger B-W turbo with intercooler and a complete Borla intake and exhaust has been installed with the appropriate tune. I drive only about 13 miles per day back and forth to work at city speeds, but I am often on the highway or cruising through the nearby forest with the pedal to the floor. I am by no means a conservative driver and I average 25.1 MPG. I have not reset that since I first bought her. So I think that pretty great on a 357 hp, 4-cylinder sports car.
 

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Discussion Starter · #5 ·
Although I topped out at 28.7 mpg on a 400 mile freeway drive, I typically get 22-24. I know Ford claims 30 MPG and yes, I know they are never correct. But am curious. At 22 MPG, maybe I should have just forked out the extra $10K for a GT.
 

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I can get 24/25 on a all freeway trip in my GT.

I think overall averages are where the Eco shines though. Hope so anyways. My overall average is only 18.4, with a freeway/city split of roughly 70/30. My in town MPG kills my overall. I think I get 12/13 in town.
 

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I am currently at just over 4K km. My overall average is 9L/100km which in American is 26 MPG. The best that I have seen during a trip (top up) was 7.2L/100km or a hair under 33 MPG but then I ran into traffic and by the time I pulled in the driveway it wasn't as good as that. The trip out that day with the top down was 7.6L/100km or ~31 MPG.
 

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Discussion Starter · #8 ·
I am currently at just over 4K km. My overall average is 9L/100km which in American is 26 MPG. The best that I have seen during a trip (top up) was 7.2L/100km or a hair under 33 MPG but then I ran into traffic and by the time I pulled in the driveway it wasn't as good as that. The trip out that day with the top down was 7.6L/100km or ~31 MPG.
WOW, impressive. I routinely am getting 22-25 MPG's. I grant I was expecting a bit more on my straight highway 400 mile road trip than 28.7, as I have taken other cars on that same trip and I got the best MPG's of each respective car by making that same road trip.
 

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I am currently at just over 4K km. My overall average is 9L/100km which in American is 26 MPG. The best that I have seen during a trip (top up) was 7.2L/100km or a hair under 33 MPG but then I ran into traffic and by the time I pulled in the driveway it wasn't as good as that. The trip out that day with the top down was 7.6L/100km or ~31 MPG.


Does top down affect MPL for you?
 

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Does top down affect MPL for you?
I would say yes, as you would get more turbulence with the top down. When I first got the car I was doing my work commute (~25 km, mostly highway in relatively good traffic as I am going the opposite way) top down both ways, weather permitting. Then I started driving in with the top up and home down, so my overall driving is probably 70/30 top down/up. I have just crossed 5K km and am showing a lifetime average of 9L/100 km (26 mpg/US gallon). However, the last couple of tanks have crept up on consumption, the last one being 9.8 (24 mpg). I am wondering if this coincides with the change to "winter" gasoline which occurred around the beginning of October.
 

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Just an add to my earlier post. I am now on winter rubber (235/55-17) and did a trip from Toronto to Niagara Falls, NY on Saturday, close to 300 km in total. Some delay idling at the bridge going, less coming back and a bit of in town driving in and around NF. I was showing 7.6 on the dash, which is just under 31 mpUSg. However, I have recently put all my receipts and mileage into a spreadsheet and not that the dash is a little optimistic, by about 0.5 litres, so on that assumption the trip returned about 29 mpUSg.
 

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Might be just me but my '14 averages about 17 to 18 lol, I think I just drive WAYYYYY too fast
 

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Discussion Starter · #13 ·
Just last week I topped out at 31.3 MPG on the freeway. But I normally get 21 City with 26 highway with a combined of 24 MPG's.
 

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FWIW my 2018 GT with the automatic averages 22 just driving around town and some highway mixed in. It gets 26.5 (on paper) on a road trip from Richmond, VA to central WV through the mountains so it looks like there isn't much of a difference with the 5.0 engine. I run cheap 87 octane and have never heard it ping.
 

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Still driving 60 miles each way I95. Very little city driving. Just hit 100K on my 2015. Still avg 25.1.



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Just an update for those who are following this thread. I've recently crossed 14K km (8,700 miles) and put the last couple of months of receipts into my spreadsheet today and the results are as follows: lifetime average (calculated) is 10L/100km (23.5 mpUSg) and average for the dash display is 9.4L/100km (25 mpUSg). I'm pretty happy with that, since the calculated mpg is just UNDER what my 2010 Sonata (2.4 with stick) was doing, and life is a lot more fun in the Mustang!
 

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I have found with my 2012 F150 EcoBoost I have my choice between Eco or Boost but not both. Same on my wife's 4 banger EcoBoost Lincoln.

Another thing I have learned about cruise control: if you have a heavy foot and a touch of aggression (Who? ME?), using cruise control to stay at an economical pace can save gas. Keeps me from trying to keep up with faster traffic and dodging for those openings in traffic.

HOWEVER, if you use self control and maintain an economical pace, you will get better mileage by regulating the speed yourself. Going down hill? Allow it to pick up a little speed and use that excess getting up the next hill. Instead of giving it the gas going up the hill, try and maintain even gas peddle pressure, keep that turbo from spinning up. Cruise Control is constantly giving it gas and letting off to maintain steady pace, working against gravity and momentum instead of utilizing it.

I rarely get the mileage figures claimed for my EcoBoost but I have taken a few occasions to really try and have gotten some pretty good numbers. My wife drives me crazy, on the gas, off the gas, on the gas, off the gas. I can get a couple more MPG on her car than she does.
 

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Discussion Starter · #19 ·
My brother has a 2018 Mustang EcoBoost that he commutes over a 100 miles per day, he says he often sees 30-31+ mpg but routinely gets 28+ miles per gallon (he currently has 15,000 miles on his car). As for me, I have now had my 2017 EcoBoost for 9 months, have put about 22K miles on it and I routinely get 23-25 mpg, with an occasional 26-28 mpg.
 

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Picked up my '19 Ecoboost in December... just hit 28,000km in it. This car is my daily driver so I have a mix of city and highway but my daily commute is only 12km each way. All the rest of that distance has been for fun.
Overall, I'm getting 8.3l/100km (28mpg).
Did a 4,800km road trip with my wife last week: Montreal to PEI to Halifax to Boston to NYC and back to Kitchener. Did a little better with a higher percentage of city driving at 8.0l/100km (29mpg).

Of an interesting note, I've been playing around with different octane fuel, running at least four tanks before switching.
I haven't found any appreciable fuel economy difference between 87 and 94 octane but the car is a lot more fun to drive when running 94.
 
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