Extreme over predicted range!

[matthew.theoret34]

Man, just went on a trip with my extended range. About 50% hwy driving. Had very light AC on. And I was only able to achieve approx 380km…

I have approx 80,000km on the truck. Two cells have been replaced.

I drive on Toyo At4’s. so obviously I’m going to lose a small percentage of range with those. But leaving the house it’s said I had 520km of range.

What could be causing this extreme difference in range?

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[RickLightning]

Your profile says "Lightening", it's Lightning...

The guessometer's range before you put in a destination is based on history. You then drove differently, "hey driving" (I assume you mean hwy driving). I assume you don't drive on the highway during your normal driving for any extended period of time?

To get a more accurate range prediction, put the destination into Ford Navigation, and start driving. That's assuming your tires have the same circumference as the OEM tires. If not, all projections will be off by the % difference.

 

[matthew.theoret34]

Yes, I understand it’s a guessometer.. but to be off by 27%!?

And I do drive about 35% of my driving on the exact hwy.

 

[Yellow Buddy]

Man, just went on a trip with my extended range. About 50% hwy driving. Had very light AC on. And I was only able to achieve approx 380km…

380km from what SoC to what? 100% to 0%? 90% to 10%? We’re going to need more context to provide input, including weather and speed.

I drive on Toyo At4’s. so obviously I’m going to lose a small percentage of range with those.

I wouldn’t call it small. The difference between optimized tires and non optimized can be as much as 15-25% depending on the tire (width, tread, compound, pressure, etc)

But leaving the house it’s said I had 520km of range.

The truck guesses and adjusts as you drive, the discrepancy can be quite large at times and minimal at others but there’s a lot of variables at play.

 

[matthew.theoret34]

380km from what SoC to what? 100% to 0%? 90% to 10%? We’re going to need more context to provide input, including weather and speed.




I wouldn’t call it small. The difference between optimized tires and non optimized can be as much as 15-25% depending on the tire (width, tread, compound, pressure, etc)



The truck guesses and adjusts as you drive, the discrepancy can be quite large at times and minimal at others but there’s a lot of variables at play.

It was 100% to about 10% so I just added the remaining km to the km travelled which brought me to 380km.

I was driving approx 100-130km/h on the hwy for 90km of it. Then side roads an average of probably 90km/h

 

[Yellow Buddy]

It was 100% to about 10% so I just added the remaining km to the km travelled which brought me to 380km.

I was driving approx 100-130km/h on the hwy for 90km of it. Then side roads an average of probably 90km/h

I have to convert some of these to imperial units as that's what I'm most familiar with...

So you went approximately 342km (212mi) on roughly 90% or 118kWh, that would be approximately 1.8mi/kWh driving between 60-80mph.

What was the temperature differential? (ie, outside temp vs interior setting)

My initial knee jerk reaction is that it seems low by roughly 10%, but factoring in that you have AT tires it may be about right.

Your initial projection of 320mi/520km is likely due to your normal usage. That's what the truck is rated for at mixed speeds with a 2.45mi/kWh (3.95km/kWh) average.

 

[matthew.theoret34]

21 in the cabin and 25 outside for temp.


Ya that’s why I think the trucks range prediction had reset, because I drive on the same hwy for about 40% of my driving, and I also tow for a business about 25% of the time.

 

[Tfarrell73]

When were your battery modules replaced? They take a while to get back to normal

 

[matthew.theoret34]

Oh about 30,000km ago. This reset felt like it happened overnight

When were your battery modules replaced? They take a while to get back to normal

 

[Firn]

I'm guessing you dont charge to 100% all that frequently?

This appears to happen to many of us, charging to 100% results in crazy range numbers that dont in any way reflect reality or our driving history. As someone who averages about 2.0. to 2.1 mi/kwh my 100% SOC range is around 345.

My belief is one of two things happens. One, the drive we do to home, typically slow (few live directly off the freeway), biases the gom. Or two, ford has a bias on the gom as it reaches 100% to give owners the impression they will get the "rated" mileage. If I had a PID for the GOM, and ideally the internal efficiency history, I could say for certain but unfortunately we dont have either. I "feel" like the GOM is more accurate below 80%.

 

[The Weatherman]

Too many possible variables to answer your question or give you comfort in why YOUR experience was described.

I’ld just sell the thing if it worried me that much.

 

[matthew.theoret34]

Too many possible variables to answer your question or give you comfort in why YOUR experience was described.

I’ld just sell the thing if it worried me that much.

Lol. Very helpful. I was just curious if that difference in range was normal.

Didn’t say it was worrying me. Was just wondering if it could be someone wrong with the cells, and if anyone had similar differences in range and could add some insight.. really what this forum is all about.

Thanks for your helpful input though!

 

[WXman]

Granted, I've only had mine for a few weeks. But the entire time I've had it my efficiency has been 2.7 to 2.8 mi/kWh. I drive gravel roads, one lane 35 MPH roads, two lane 45 MPH roads, 4 lane 55 MPH roads, and 4 lane 70 MPH roads on a weekly basis. No matter what it's always 2.7 to 2.8. The truck is bone stock obviously.

I have a set of 295/70R18 off road tires sitting in my barn that I'm dying to put on the truck, but if you guys are asserting that I will lose a full 1 mile/kWh by doing so I might have to rethink that plan.

 

[Yellow Buddy]

Lol. Very helpful. I was just curious if that difference in range was normal.

Didn’t say it was worrying me. Was just wondering if it could be someone wrong with the cells, and if anyone had similar differences in range and could add some insight.. really what this forum is all about.

Thanks for your helpful input though!

Normal? Yes and no. There's nothing that would worry me tremendously if I got that, but you are on the lower side. I suspect the combination of your AT tires, and the amount of time you spent at 80 vs 60.

I have never gotten more than 290 miles out of my truck on a 100% to 2% drain. I routinely get more than 250 miles though.

One thing in particular to note is that 80mph barrier. At 85mph, the amount of time to reach our destination will actually take longer than if we slowed to 75-80mph as our charging speeds (and associated overhead) outweighs the speed gain. 70-75mph seems to be optimal from a timing perspective, and for hitting the rated range it would require 55-65mph.

 

[MichaelCA]

I get 1.8mi/kw going 80 mph. At 70 its 2.2-2.3mi/kw. With heavier traffic, I can achieve 2.6-2.8mi/kw. I think if you keep it around 70mph aka 110-115km/hr you will see a 20% increase in range.

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