Average mi/kwh

[SaratogaLefty]

Just to throw this in:

While this may sound strange... I seem to get better mi/kWh if I do NOT use ACC. Will do more testing. Anyone else seeing that???

I also think there is something up with the since last charge vs. trip meter calculation. My since last charge power used number will occasionally block to 5 kw and then blink back to whatever number it was showing previously.

I'm wondering if everyone is using Smooth mode when trying to maximize mi/kwh? Maybe it does better in Swift mode??

 

[AZLucidGuy]

I have a GT R, 19". Just got 4.4 mi/kWh after leaving an Electrify America charger. I had Adaptive Cruise on the whole time at 75 and then 65 with then speed limit changed.

 

[Hcuellar77]

GT 21 inch wheels 865 miles driven. Just took my car for a round trip from San Diego to LA and back to catch a hockey game. Since delivery, I’ve been mucking around 2.7-2.9 mi/kWh without paying any attention to range conservation but kept on reading about these awesome numbers here on the forum so I wanted to check if my car was ok. Charged to 100% before going and zeroed my Trip A. On the trip to LA on a Sunday afternoon with fairly heavy traffic and ACC strictly set to 70 mi/h, I was pleasantly surprised to get 4 mi/kWh.

On the trip back from LA to San Diego at around midnight with almost completely open roads all around, I had no interest in battery conservation so set ACC to 80 and then 90 with frequent override, at which point I learned that ACC maxes out at 90 (at least on my car). Speeds were not infrequently in the 100-120 range. Destroyed my average mi/kWh until I ended up back down at 3.1 by the time I arrived home.

But looks like with conservative driving, very close to EPA can be obtained.

Great to hear you can get 4+ on 21” wheels GT, will keep trying. ACC is always on at 73 in my case. I posted numbers in Smooth mode which I assume is the conservation mode.

 

[joec]

Then, without thinking about it too deeply, ”It’s all about [the wheel size].” You’re the first post I’ve noticed that mentions 19” wheel rims. Most reports have been from those driving on 21” rims.

They call them “range” wheels for a reason. The rep I spoke to in Millbrae told me the difference in range between 19 and 20 OR 21 was significant. As in, either 20 or 21 would drop your range by more than 50 miles.

For me, living in CO, 19s are a no-brainer. Getting snow tires for 20 or 21-inch wheels is no picnic.

 

[MPawelek]

It would be interesting to have a dozen Airs get together and drive the same route, same speed and same mileage and see if the mi/KWh was the same for similar wheel sizes.

 

[hydbob]

It would be interesting to have a dozen Airs get together and drive the same route, same speed and same mileage and see if the mi/KWh was the same for similar wheel sizes.

Can I volunteer the bay area group? Paging @borski , @copper , @Paladin732 , @SaratogaLefty

 

[Demosthenes]

I might have stumbled on to something in regards to range calculation....

on my last charge to 85% I reset one of my trip meters. From that point I drove the battery down to about 60% SOC- the calculations from "Since last Charge" and my reset trip meters did not show the same mile per KWH- since last charge showed 2.5 M/KWH and the trip meter showed 3.4. Both showed the exact same miles driven but the miles per KWH were almost a mile different! Should these 2 numbers not be the exact same number based on the reset of trip meter? What am I missing?

Has anyone else seen this?
Try the same exercise and report back if not.

We might have a software bug that is giving some of us erroneous numbers......

Very interesting. If this is replicable and not just a one off glitch, maybe the lucid software uses different algorithms to calculate average mi/kWh for ‘Trip’ vs ‘Since last charge’. I notice that the average mi/kWh is wildly inaccurate when it first starts calculating after a charge and takes some time to ‘calibrate’.

 

[Coltonw011]

Very interesting. If this is replicable and not just a one off glitch, maybe the lucid software uses different algorithms to calculate average mi/kWh for ‘Trip’ vs ‘Since last charge’. I notice that the average mi/kWh is wildly inaccurate when it first starts calculating after a charge and takes some time to ‘calibrate’.

It’s not that it’s inaccurate, it just has a much smaller sample size of drive length so every variable is much more pronounced (speed changes, pedal aggression, stop and go, elevation etc.) It averages out after you drive a longer distance.

 

[Sandvinsd]

It’s not that it’s inaccurate, it just has a much smaller sample size of drive length so every variable is much more pronounced (speed changes, pedal aggression, stop and go, elevation etc.) It averages out after you drive a longer distance.

It should be identical. If one reset the trip calculator at the time the last charge ended, they should be the same As they are calculating from the same starting point. If not, then there is a software glitch.

 

[SaratogaLefty]

Can I volunteer the bay area group? Paging @borski , @copper , @Paladin732 , @SaratogaLefty

Actually that would be a great experiment. We could all meet at Alice's Restaurant and drive West over to Highway 1, up North to 92, and then back to Alice's. That would be about 40 miles with some windy roads, hills, and great ocean views. As long as we all set Trip A at the start we should get the same distance/mi/kwh results.

 

[Bbq9]

Actually that would be a great experiment. We could all meet at Alice's Restaurant and drive West over to Highway 1, up North to 92, and then back to Alice's. That would be about 40 miles with some windy roads, hills, and great ocean views. As long as we all set Trip A at the start we should get the same distance/mi/kwh results.

I’d be up for it

 

[Demosthenes]

It should be identical. If one reset the trip calculator at the time the last charge ended, they should be the same As they are calculating from the same starting point. If not, then there is a software glitch.

Yes exactly. Or the software is using different algorithms to calculate ‘Trip’ vs ‘Since last charge’ for some mysterious reason.

 

[Demosthenes]

Great to hear you can get 4+ on 21” wheels GT, will keep trying. ACC is always on at 73 in my case. I posted numbers in Smooth mode which I assume is the conservation mode.

I’m not sure if the driving mode impacts range if everything is handled by ACC

 

[Coltonw011]

It should be identical. If one reset the trip calculator at the time the last charge ended, they should be the same As they are calculating from the same starting point. If not, then there is a software glitch.

You misread the post I was replying to. This is specific to the “since last charge” mi/kWh alone. The post I replied to states that the since last charge readings are wildly inaccurate after just charging.
Well, so are mpg after just refueling until you drive more and even it out.
I wasn’t talking about the trip meter vs. since last charge meter.

 

[Sandvinsd]

You misread the post I was replying to. This is specific to the “since last charge” mi/kWh alone. The post I replied to states that the since last charge readings are wildly inaccurate after just charging.
Well, so are mpg after just refueling until you drive more and even it out.
I wasn’t talking about the trip meter vs. since last charge meter.

I understand that. The shorter the distance in the calculation, the less accurate the kw/hour reading. However, the trip meter should show that same wildly inaccurate reading then since it was reset at the time of last charge.

 

[Coltonw011]

I understand that. The shorter the distance in the calculation, the less accurate the kw/hour reading. However, the trip meter should show that same wildly inaccurate reading then since it was reset at the time of last charge.

It does for me. It’s inaccurate in comparison to the since last charge meter as well though. That may be by design as the since last charge meter drops if you sit in your vehicle listening to music etc, while my trip meter stayed the same. As @hydbob said, it may do total energy used vs the trip meter using motor power only.

 

[Sandvinsd]

I will do a detailed calculation on the energy consumption, if and when they finally decide to deliver the car.

 

[niceguy]

It would be interesting to have a dozen Airs get together and drive the same route, same speed and same mileage and see if the mi/KWh was the same for similar wheel sizes.

Make sure drivers are also same weight!!! I would consume more battery than more in shape members of forum

 

[Sandvinsd]

Make sure drivers are also same weight!!! I would consume more battery than more in shape members of forum

There are a lot of factors that go into the efficiency. I would like to depend on the numbers the car shows on the screen. True efficiency would be miles driven divided by kW dispensed. it would account for all the losses along the way. For an ICE , it’s easy. I fill up the tank and record the miles. Drive and fill up again, record the miles driven. I look at the pump for the number of gallons dispensed and calculate my mpg. of course it varies with every fill up, but I can get a sense over time as to how the car is performing through cumulative numbers. My mpg calculation is very close to what the car tells me. For an EV, some of the kW get lost along the way, unlike filling up a gas tank (unless you overflow and spill gas on the ground). Those losses need to be taken into account for true efficiency. After all, I am paying for all the electrons dispensed, not just for the ones entering the car and I can get an apples to apples comparison with my ICE.

Then there is the efficiency on the road to accurately account for range, which I also want to know. I need to know how many kW are in the battery when I start, how many miles I have driven and then how many kW it takes to fill up. The kW it takes to fill up has those cable and heat losses included so I won’t have a real idea as to how many kW entered the battery. The car computer should account for that and give me an accurate reading for miles driven divided by kW consumed. I can calculate if it is giving me an accurate picture. For arguments sake, assume the battery size is 100kW when full. I drive it down to 20% which means I have used 80 kW. If the car says I averaged 3 miles per kW, then I should have driven 240 miles. That should match the speedometer reading. It is THAT number that I want to be accurate on the car when on trips.

 

[HC_79]

I haven't done a road trip yet but I guess i'm averaging around 3.5. I went from Santa Clarita to Anaheim on Saturday and got 4.1 \ 4.2 and on the way back 3.5 \ 3.7. I'm not watching the consumption like a hawk but was happy with the numbers when checking. I'm on 21" wheels and have had AC set to 68/70 most times.