Range halved after long drive?

[RickMachE]

Somebody has to laugh...

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[hprose]

On a road trip over the weekend I saw 2.0 miles per kwh but averaged 90mph. If I drove slower my miles per kwh were much better

Wind resistance is not linear, it’s squared. At 90 mph, EV or ICE, range goes out the window. You are driving at near stage 2 hurricane speed. Not judging that - I used to drive that and a lost faster. If it’s safe and no one is watching, it’s fun. But the MME is a crossover SUV. It doesn’t have the aerodynamics of a Ferrari. Your range becomes toast.

 

[dmcc55]

Update: confirmed yesterday that my battery is totally fine. Reset EV driving history is indeed the answer. Drove 160+ miles, half of which through Shenandoah NP to give an idea of elevation change, completely as normal.

I'm actually perfectly happy for Ford to update range estimation algorithms. What I don't quite understand is how that manages to suddenly break and start estimating that my range is half of what it should be. But at least now I know that it's something to watch out for.

Thanks everyone here for all of your help.

 

[alexgorod]

I got the same crap and now GOM shows 70 miles for 70% charge.

 

[DevSecOps]

I'm gonna find out who does GOM calculations at Ford and ask them to do my taxes since they like to drastically reduce numbers for no apparent reason.

 

[timbop]

I'd love to do that, but the whole premise of my concern is whether my battery is suddenly degraded and I am not working with as many kWh. So I can't compute kWh used from SoC. Theoretically I could compute from the trip computer's mi/kWh, but then on one of the trips since this started happening, I drove for a solid 7 mi with it telling me I was at 0 mi/kWh, so I'm not sure I can trust that either.

If you really need to compute that and don't have a smart L2, then you can ballpark it with a DCFC to measure the kwh you put back into the battery to get back to the starting percentage.

To compute range it doesn't matter how many kwh the battery has: go for a drive with an arbitrary charge level (say 75%). Drive x miles and note the percentage left when done and plug the values into:
portion of battery used = (percent start - percent done) / 100
range = (miles driven) / (portion of battery used)

So assuming a 120 mile drive starting at 75% and finishing at 35%:
range = 120 / .4 = 300 miles

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