Texas FFE
Posts: 117
Joined: Wed Aug 03, 2016 6:26 am

2017 FFE range at speed

Sat Jul 08, 2017 3:00 pm

When I bought my 2013 FFE I ran some experiments to see how far I could go at certain speeds in preparation for a cross country trip. Basically I started off with a full charge and I drove around in a big loop at a set loop until I had to head to the nearest charging station. The important data I obtained was 163 Wh/mi at 40 mph, 193 Wh/mi at 50 mph, 236 Wh/mi at 60 mph and 293 Wh/mi at 70 mph.

Since this information was obtained during real world conditions over a full battery charge I consider this information to repeatable and indicative of all FFEs. This information was extremely useful to me on my cross country trip keeping me from ever running out of charge over the 1,800 mile trip with some very challenging charging conditions. Now that I have purchased a 2017 FFE I decided to try to extrapolate the data I obtained on my 2013 model.

I used the data to form fit a third degree polynomial equation based on the four data points. The results very closely matched my measured data point so I decided to share my results. The results of the equation based on 95% usage of 28.8 kWh measured on my battery draw down test are as follows;
  • mph Wh/mi range
    10 123 223
    20 131 209
    30 143 191
    40 163 168
    45 176 155
    50 192 142
    55 211 129
    60 234 117
    65 260 105
    70 290 94
    75 324 84
    80 363 75
    85 407 67
I hope you find this information useful on any trips you plan to take in your FFE. The watts per mile should be valid for all FFEs but be sure to base your range on your own draw down test. Also remember that external factors like wind, hills, vehicle loading and the use of air-conditioning can dramatically impact your actual Wh/mi.
Last edited by Texas FFE on Sun Jul 09, 2017 7:39 pm, edited 2 times in total.
2017 Blue Candy FFE
2015 Teutonic Silver Fusion Energi Titanium w/Adaptive Cruise Control
2004 White GMC Envoy XL SLT 4WD

elec2017
Posts: 20
Joined: Mon Apr 03, 2017 10:29 am

Re: 2017 FFE range at speed

Sun Jul 09, 2017 6:37 am

Hi Texas, thanks for posting those number, very helpful!

Texas FFE
Posts: 117
Joined: Wed Aug 03, 2016 6:26 am

Re: 2017 FFE range at speed

Fri Sep 01, 2017 10:05 pm

I was able to validate the information above on my 2017 FFE. I traveled 112 miles between charges at a constant speed of 59 mph. I had 18% battery remaining and my Guess-O-Meter indicated 25 miles available at the end of the drive.

This drive was made with the radio and the air conditioning completely off. The drive was made on a warm summer night on a highway where I could maintain a constant speed. The Guess-O-Meter fluctuated wildly during the drive with as much as 10 miles variation in either direction.

Word of warning; don't depend entirely on your Guess-O-Meter when you're on a long distance drive.
Last edited by Texas FFE on Sat Sep 02, 2017 10:27 am, edited 1 time in total.
2017 Blue Candy FFE
2015 Teutonic Silver Fusion Energi Titanium w/Adaptive Cruise Control
2004 White GMC Envoy XL SLT 4WD

jjsv1
Posts: 50
Joined: Sat Jan 07, 2017 3:50 pm
Location: Orlando, FL

Re: 2017 FFE range at speed

Sat Sep 02, 2017 7:57 am

Excellent warning. I never go by the GOM when I'm going on the highway. I always look at battery percentage and kw/h used on the trip meter. It's a good day if I can get 60 miles out of mine on the highway going 55-65
'13 FFE 36,000 Miles w/15 Kwh left

FiSh
Posts: 45
Joined: Tue Aug 01, 2017 6:35 am

Re: 2017 FFE range at speed

Tue Sep 05, 2017 7:15 am

Texas FFE wrote:I was able to validate the information above on my 2017 FFE. I traveled 112 miles between charges at a constant speed of 59 mph. I had 18% battery remaining and my Guess-O-Meter indicated 25 miles available at the end of the drive.

This drive was made with the radio and the air conditioning completely off. The drive was made on a warm summer night on a highway where I could maintain a constant speed. The Guess-O-Meter fluctuated wildly during the drive with as much as 10 miles variation in either direction.

Word of warning; don't depend entirely on your Guess-O-Meter when you're on a long distance drive.
So, your test run gave you about 137 miles range on 59 mi/h, which is much better than predicted ~120. Good to hear.
What was you Wh/mi on that trip?
2017 FFE, Oxford White

damania
Posts: 180
Joined: Sat Dec 13, 2014 6:03 pm

Re: 2017 FFE range at speed

Tue Sep 05, 2017 9:50 am

Amazing how much loss is there even at 65mph. I wonder if almost all of it is wind resistance? Dual motor vehicles have 10% better range, so some of it is due to motor inefficiency (rpm/torque range).

EVA
Posts: 874
Joined: Tue Aug 06, 2013 9:10 pm
Location: Chicago Area

Re: 2017 FFE range at speed

Tue Sep 05, 2017 11:02 am

damania wrote:Amazing how much loss is there even at 65mph. I wonder if almost all of it is wind resistance? Dual motor vehicles have 10% better range, so some of it is due to motor inefficiency (rpm/torque range).
Wind resistance is the big energy use. The motor has little effect on energy (that dual motor thing you mention - is probably a Tesla and they use something altogether different to make that 10% increase - has nothing to do with wind resistance).

It is oddly simple physics. The power to push something through the air at increasing speed increases exponentially. Depending on how smooth that object is, determines how big the effect. An FFE isn't exactly the most aerodynamic vehicles around.
2014 Platinum White FFE (Turning in mid Dec. 2016 25,000 miles)
2013 Ingot Silver FFE
2012 Titanium ICE Focus
2014 Tesla Model S 85

spirilis
Posts: 154
Joined: Fri Jul 14, 2017 4:53 am
Location: Maryland

Re: 2017 FFE range at speed

Tue Sep 05, 2017 11:07 am

EVA wrote:
damania wrote:Amazing how much loss is there even at 65mph. I wonder if almost all of it is wind resistance? Dual motor vehicles have 10% better range, so some of it is due to motor inefficiency (rpm/torque range).
Wind resistance is the big energy use. The motor has little effect on energy (that dual motor thing you mention - is probably a Tesla and they use something altogether different to make that 10% increase - has nothing to do with wind resistance).

It is oddly simple physics. The power to push something through the air at increasing speed increases exponentially. Depending on how smooth that object is, determines how big the effect. An FFE isn't exactly the most aerodynamic vehicles around.
If anyone's not already familiar with it, check out this page - http://www.jurassictest.ch/GR/

Map out a route and change the average vehicle speed (uncheck Automatic speed). Fun watching how speed dramatically varies the power consumption as well as elevation.
2017 Ford Focus Electric (Magnetic)
2017 Ford C-Max Energi SE (Kona Blue)

TrojanEV
Posts: 43
Joined: Mon Nov 10, 2014 4:49 pm
Location: Los Angeles, CA

Re: 2017 FFE range at speed

Thu Oct 26, 2017 1:51 pm

What am I missing here? There is no way in the world my FFE would have between 105-117 miles of range if I drove at a constant 60-65 mph. Are people really achieving this kind of range? The longest trip I've attempted is a little over 80 miles and my FFE didn't quite make it (had to stop about 5 miles short of my destination).

Does anyone else notice that for really short trips their kWh usage can be through the roof? I have about a 1.5 mile trip home from work and it's uphill slightly (we live in the foothills) but nothing crazy. According to my trip log, my average economy is sometimes 350 to 450 kWh and I'm going at best 45-50 mph tops (probably averaging 35 mph). Going to work (so going downhill) it's much lower, but still in the 150 kWh range. I admit I'm not the most efficient EV driver, but my numbers seem pretty far off from the posted chart.
2014 Blue Candy FFE

campfamily
Posts: 439
Joined: Tue Apr 21, 2015 8:07 am
Location: Southern California

Re: 2017 FFE range at speed

Thu Oct 26, 2017 1:59 pm

TrojanEV wrote:What am I missing here? There is no way in the world my FFE would have between 105-117 miles of range if I drove at a constant 60-65 mph. Are people really achieving this kind of range? The longest trip I've attempted is a little over 80 miles and my FFE didn't quite make it (had to stop about 5 miles short of my destination).
You would have this range if you had a 2017 FFE. Those of us with 2016 and older FFEs are stuck with 75 miles on a good day. :-(
GONE - 2015 FFE, Magnetic with leather interior, debadged & tinted
38,500 miles (since May 2015), average 246 Wh/mile

REPLACED WITH - 2018 Tesla Model3, LR RWD, Obsidian Black
11,000 miles (since Nov 2018), average 235 Wh/mile

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