GOM seems a bit pessimistic

JamieGeek

Well-Known Member
Joined
Dec 29, 2019
Threads
82
Messages
3,556
Reaction score
6,746
Location
Southeastern Michigan
Website
spareelectrons.wordpress.com
Vehicles
Mach-E, old: Bolt, C-Max Energi, Focus Electric
Country flag
This morning I went for a little drive (100 miles or so, see trip meter). When I left it was -3F out, when I arrived home it was 20F out. Range when I left was showing 180 miles with 100% charged. Reset the Trip 1 meter sitting in the garage before pulling out after preconditioning it for a good 30 minutes.

Lets look at some details:
Ford Mustang Mach-E GOM seems a bit pessimistic 1613588678763

When I got home:
Ford Mustang Mach-E GOM seems a bit pessimistic 1613588706972

Here you see I have 53% battery left which means I used 47% of the battery.

This means I used 88*.47=41.4kWh of electricity.

If I do this: 103.7/41.4 = 2.5miles/kWh...thats funny the trip meter says 2.3.

Using the 2.5 miles/kWh figure means my 100% range should have been 220 miles and my current GOM should be showing 116 miles.

(I'm guessing the trip computer uses the GOM value to come up with the 2.3 figure instead of simply using the miles traveled!?)

Cruise control was set at 77mph and HVAC was set to 68F (Note, however, that the first leg of the trip--1/2 of it--was during rush hour and I didn't get a chance to do 77 mph that much. The 2nd leg was pretty much all 77 mph.)
 

zhackwyatt

Well-Known Member
Joined
Dec 18, 2019
Threads
14
Messages
1,603
Reaction score
2,616
Location
Arizona
Vehicles
'21 InfBlu Prem MMEx Past: '13 C-Max '98 Explorer
Country flag
This morning I went for a little drive (100 miles or so, see trip meter). When I left it was -3F out, when I arrived home it was 20F out. Range when I left was showing 180 miles with 100% charged. Reset the Trip 1 meter sitting in the garage before pulling out after preconditioning it for a good 30 minutes.

Lets look at some details:
Ford Mustang Mach-E GOM seems a bit pessimistic 1613588706972

When I got home:
Ford Mustang Mach-E GOM seems a bit pessimistic 1613588706972

Here you see I have 53% battery left which means I used 47% of the battery.

This means I used 88*.47=41.4kWh of electricity.

If I do this: 103.7/41.4 = 2.5miles/kWh...thats funny the trip meter says 2.3.

Using the 2.5 miles/kWh figure means my 100% range should have been 220 miles and my current GOM should be showing 116 miles.

(I'm guessing the trip computer uses the GOM value to come up with the 2.3 figure instead of simply using the miles traveled!?)

Cruise control was set at 77mph and HVAC was set to 68F (Note, however, that the first leg of the trip--1/2 of it--was during rush hour and I didn't get a chance to do 77 mph that much. The 2nd leg was pretty much all 77 mph.)
Maybe trip doesn't account for regen.
 
OP
OP
JamieGeek

JamieGeek

Well-Known Member
Joined
Dec 29, 2019
Threads
82
Messages
3,556
Reaction score
6,746
Location
Southeastern Michigan
Website
spareelectrons.wordpress.com
Vehicles
Mach-E, old: Bolt, C-Max Energi, Focus Electric
Country flag
climate use 28%...
That is a possibility: The trip meter is only using kWh for route to calculate its miles/kWh figure.

But that would make the miles/kWh value larger.

(Frankly 28% is pretty good in <0F temps.)
(Still think the trip meter there should list out the values in kWh; not percentages.)
 


AllenXS

Well-Known Member
First Name
Allen
Joined
Jan 11, 2021
Threads
13
Messages
1,188
Reaction score
1,571
Location
Richmond, BC, Canada
Vehicles
Premium Blue ER AWD
Country flag
I noticed the same thing. Car said I had 100 miles of range, drove 80 miles, had 50 miles of range left. It's like Jesus and the fishes or something.
Did you check the frunk for loaves as well?
 

LeeLeeMachE

New Member
Joined
Jul 24, 2021
Threads
1
Messages
4
Reaction score
3
Location
Virginia
Vehicles
Iconic Silver Mustang Mach E California Route 1
Country flag
With my Bolt, it would estimate range based on average driving conditions and average driving style, but I drive very efficiently for an EV and could always exceed the estimate unless I had to use wipers, defrost, heat or AC. Also, it gave me a range for my range, which adjusted on the fly as conditions during the trip turned out to be better or worse than average, basically "best case, worst case, and expected" numbers. That would be nice to have (and I admit it could be in the maze of Mach e menu options somewhere, I just haven't found it yet).
 

KrazyEd

Well-Known Member
First Name
Ed
Joined
Apr 3, 2021
Threads
0
Messages
63
Reaction score
38
Location
Las Vegas, NV
Vehicles
Carbonized Gray Metallic Premium Mustang Mach E
Occupation
Transportation
Country flag
EVs are FAR more efficient than ICE vehicles so minimal differences are magnified.
If city driving a BEV, you get more regen, less wind resistance etc. ICE vehicle has to
use all of it's inefficient engine to get the car moving. Since it is SO bad, the difference
isn't that noticeable. On the highway, it isn't changing things as much, so efficiency gets
better, thus better MPG at freeway Speeds. The EV is already very efficient plus regen in
city so City MPGe is better. Once at freeway speeds, less regen, Far more wind resistance.
When Cold, the ICE vehicle uses heat that has already been produced to heat the cabin.
BEV must " create " the heat so much greater energy used. If solo, using the heated seats
use much less energy than climate control. I wouldn't suggest trying it with family in the car.
A few years ago, Kia lost a law suit over a few MPG. Not many people will sue because they
get BETTER than promised. EPA allows manufacturers to LOWER their range estimates, but
not increase them. Ford did this with the Mach E. EPA range is something like 5~10 miles
LOWER than EPA found when testing the cars. Most early testers were Ricky Racing around
and getting lower than projected. Once people own them, that changes a little.
I have a little over 5,000 miles on my Standard Range Rear Wheel Drive Premium with more
than half of the miles on the freeway ( usually lower than posted speed driving ). My LifeTime
Miles / KW is 4.8. Usually around mid 6 Miles / KW around town. Seldom used anything other
than heated seats when cold. Only use A/C if over 100 degrees, which is a LOT here in Vegas
in the summer. Attached is a Screen Shot from FordPass for my 230 mile range battery.
This isn't an outlier, it is similar to what I normally see. Day off today, so will be doing some driving around. Otherwise, I usually only charge to 40% to 60%. MUCH Lower range when using A/C.
Also including an image from my 2020 Chevrolet Bolt with similar mileage from last year.
Range improved on the Bolt by another few % as I got used to it.
Ford Mustang Mach-E GOM seems a bit pessimistic Bolt_Range


Ford Mustang Mach-E GOM seems a bit pessimistic Range
 
Last edited:

Kamuelaflyer

Well-Known Member
Joined
Feb 18, 2020
Threads
9
Messages
7,922
Reaction score
15,845
Location
Hawaii
Vehicles
2021 Premium Infinite Blue. ER AWD. 2020 Raptor
Country flag
EVs are FAR more efficient than ICE vehicles so minimal differences are magnified.
If city driving a BEV, you get more regen, less wind resistance etc. ICE vehicle has to
use all of it's inefficient engine to get the car moving. Since it is SO bad, the difference
isn't that noticeable. On the highway, it isn't changing things as much, so efficiency gets
better, thus better MPG at freeway Speeds. The EV is already very efficient plus regen in
city so City MPGe is better. Once at freeway speeds, less regen, Far more wind resistance.
When Cold, the ICE vehicle uses heat that has already been produced to heat the cabin.
BEV must " create " the heat so much greater energy used. If solo, using the heated seats
use much less energy than climate control. I wouldn't suggest trying it with family in the car.
A few years ago, Kia lost a law suit over a few MPG. Not many people will sue because they
get BETTER than promised. EPA allows manufacturers to LOWER their range estimates, but
not increase them. Ford did this with the Mach E. EPA range is something like 5~10 miles
LOWER than EPA found when testing the cars. Most early testers were Ricky Racing around
and getting lower than projected. Once people own them, that changes a little.
I have a little over 5,000 miles on my Standard Range Rear Wheel Drive Premium with more
than half of the miles on the freeway ( usually lower than posted speed driving ). My LifeTime
Miles / KW is 4.8. Usually around mid 6 Miles / KW around town. Seldom used anything other
than heated seats when cold. Only use A/C if over 100 degrees, which is a LOT here in Vegas
in the summer. Attached is a Screen Shot from FordPass for my 230 mile range battery.
This isn't an outlier, it is similar to what I normally see. Day off today, so will be doing some driving around. Otherwise, I usually only charge to 40% to 60%. MUCH Lower range when using A/C.

Ford Mustang Mach-E GOM seems a bit pessimistic Range
On the other hand, AWD ER has decreased from the initial 260-mile range guess at purchase to 190 miles range at 100% SOC about 2000 miles later. And with a lifetime 3.7 miles/kWh.

The GOM is worthless.
 
 




Top