Check my math, please.

[Clif1f]

My most recent electricity bill, including taxes and fees was $122.33. Subtracting the fixed connection charge of $10, the total cost of electricity was $112.33. I used 588 kWh of electricity. Dividing $112.33 by 588, I get a unit cost of $0.1910/kWh. Last night I added 21 kWh of juice to the battery. 21 x 0.1910 = $4.0117 cost to recharge.
The car tells me I added 21 miles of range. So $0.19/mile.

The closest gas station is selling regular for $3.359/gallon. My 2017 Toyota Highlander Hybrid gets about 25 mpg. $3.359/25 = $0.134.

Is this right? Is this the experience of other users?

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[Ecupip]

I believe the R1’s should average 2 miles per KWH give or take. So you should half your figure to $.08/mile for the R1.

 

[Guy]

Your cost of electricity is reasonable, the issue is the vehicle saying only 21 miles of range added. That equates to roughly 1 mile per kWh. There is c. 10% loss from the charger into the vehicle battery but if you get 2 miles per kWh the your cost per mile is around 10c.

 

[elektrode]

Do you use gas or kerosene lamps to light your house or gas powered steam to power your fridge and washers?

Your electricity bill isn’t 100% for your truck is it?

 

[Donald Stanfield]

I get over 2kWh per mile. My electricity is also much cheaper at .10 per kWh and my old car took premium gasoline. IDK if your math is right but it certainly isn't for me. Where I'm standing I operate a pickup truck for a fraction of what my small Audi SUV cost me.

 

[ads75]

The better math, would be to multiply your rate times what you put into the battery. I think my rate is $0.16/kw.

$0.16kw x 135kw = $21.60 to fill the truck from completely empty. (although what is useable from the battery would make it somewhat less)

Do NOT include the electric bill for the rest of your house.

 

[Dark-Fx]

Where are you seeing the 21kWh delivered? I can't attest for the Rivian EVSE but some of the cheaper brands don't account for the actual voltage in their energy calculations. If you live somewhere the voltage is kind of low, it could be inflated by 10% or more.

 

[Scoiatael]

You guys are lucky. I pay $0.25 per kw off peak. I do have solar which helps some. Still much cheaper than gas. It's $4.59 per gallon right now, but was $5.89 a few weeks ago.

 

[Zoidz]

Do you use gas or kerosene lamps to light your house or gas powered steam to power your fridge and washers?

Your electricity bill isn’t 100% for your truck is it?

The better math, would be to multiply your rate times what you put into the battery. I think my rate is $0.16/kw.

$0.16kw x 135kw = $21.60 to fill the truck from completely empty. (although what is useable from the battery would make it somewhat less)

Do NOT include the electric bill for the rest of your house.

OP was using his entire electric bill to calculate a unit cost per kWh, and then using the vehicle reported consumption with that unit cost to calculate the vehicle cost. Therefore, his calculation does not include home kWh usage.

 

[Clif1f]

Do you use gas or kerosene lamps to light your house or gas powered steam to power your fridge and washers?

Your electricity bill isn’t 100% for your truck is it?

Of course not. I was calculating the cost per kWh compare it to cost per gallon of gas.

Your response, in
addition to being snarky, indicates you didn't understand my question.

 

[SANZC02]

OP was using his entire electric bill to calculate a unit cost per kWh, and then using the vehicle reported consumption with that unit cost to calculate the vehicle cost. Therefore, his calculation does not include home kWh usage.

Most of the math seems good, only question would be where the kW number and mile number comes from. On L2 21 kW would be about 2 hours and about 21 miles an hour so should have added 42 miles not 21.

 

[SDH]

You guys are lucky. I pay $0.25 per kw off peak. I do have solar which helps some. Still much cheaper than gas. It's $4.59 per gallon right now, but was $5.89 a few weeks ago.

CA 'sunshine' tax

 

[SciGuy]

My most recent electricity bill, including taxes and fees was $122.33. Subtracting the fixed connection charge of $10, the total cost of electricity was $112.33. I used 588 kWh of electricity. Dividing $112.33 by 588, I get a unit cost of $0.1910/kWh. Last night I added 21 kWh of juice to the battery. 21 x 0.1910 = $4.0117 cost to recharge.
The car tells me I added 21 miles of range. So $0.19/mile.

The closest gas station is selling regular for $3.359/gallon. My 2017 Toyota Highlander Hybrid gets about 25 mpg. $3.359/25 = $0.134.

Is this right? Is this the experience of other users?

Do you tow regularly with the truck? Maybe that’s why you’re getting 1 mile/kWh. What mileage do you get with the Toyota when towing (if you do)?

 

[Rivdog]

You can also go into gauge view and see exactly how many kWh your Rivian has used. Multiply that by your total electricity delivery cost per kWh and then you’ll have a pretty good estimate of what it costs. I did that the other day and realized that if I had an ICE vehicle that got about 27 MPG at $4.50 per gallon, there wouldn’t be any fuel cost savings with the Rivian.

I didn’t buy a vehicle this expensive to save a few bucks on fuel though, I bought it because it’s freaking awesome. Was a bit surprising nonetheless to see the break even point was so low.

 

[jjswan33]

You can also go into gauge view and see exactly how many kWh your Rivian has used. Multiply that by your total electricity delivery cost per kWh and then you’ll have a pretty good estimate of what it costs. I did that the other day and realized that if I had an ICE vehicle that got about 27 MPG at $4.50 per gallon, there wouldn’t be any fuel cost savings with the Rivian.

I didn’t buy a vehicle this expensive to save a few bucks on fuel though, I bought it because it’s freaking awesome. Was a bit surprising nonetheless to see the break even point was so low.

I think you are paying too much for electricity.. I‘m also in OR and I am on the PGE time of use plan. 10pm-6am means rates of around 0.04/kWh (0.058/kWh including transmission charges/fees)

My truck with the camper shell gets ~1.6mi/kWh, so at $4.50/gal I would need 124 mi/gal to break even with an ICE truck. I think most trucks with the type of build I have would probably only do 10% of that. Of course it’s all more complicated because I have solar panels which means I don’t end up paying any peak rates for my electricity, I also paid for the solar panels.

Edit: Math is hard.

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