1 gallon of diesel is ~40kWh. So more than 20 MPGe.
Edited to correct numbers. (Thanks @navguy12 for pointing out my mistake.)
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Tesla, TSLA & the Investment World: the Perpetual Investors' Roundtable
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Edited to correct numbers. (Thanks @navguy12 for pointing out my mistake.)
The speed limit in California for combination Tractor/Trailers is 55 mph.
Answering my own question, in part.
At 33.7 kWh being the energy contained in one gallon of gasoline, then Tesla’s truck gets better than 16.8mpg gasoline equivalence. I’ll do the diesel shortly, but I do not understand whether the efficiency of a combustion engine plays into this. I think not, but.
On edit:It’s not clear why @MP3Mike ’s numbers differ so much from mine.
On re-edit: now it's clear
On re-re-edit: @Cosmacelf thinks the combustion engine's efficiency is hyper-important.
At 33.7 kWh being the energy contained in one gallon of gasoline, then Tesla’s truck gets better than 16.8mpg gasoline equivalence. I’ll do the diesel shortly, but I do not understand whether the efficiency of a combustion engine plays into this. I think not, but.
On edit:It’s not clear why @MP3Mike ’s numbers differ so much from mine.
On re-edit: now it's clear
On re-re-edit: @Cosmacelf thinks the combustion engine's efficiency is hyper-important.
ElectricIAC
Good-Natured Rascal
If using superchargers though that’s probably more like $3-5 factoring in conversion losses.
thesmokingman
Active Member
From light googling I got 6.5 mpg on average for semi-trucks.
navguy12
Active Member
One litre of diesel has ~10 kWh. US gallon has about 3.8 litres so about 38 kWh per gallon of diesel (all ball park numbers)
ElectricIAC
Good-Natured Rascal
For an OTR truck going highway speeds for long sectors between breaks that’s probably closer to accurate.
thesmokingman
Active Member
It's a helluva time to be invested in Tesla stock.
Daniel in SD
(supervised)
82k is gross weight not load. Obvious unanswered question is what the truck itself weighs.
Seems pretty awesome though assuming you can charge it for a reasonable price (less than L3 chargers)
Be careful about kWh energy content for either gasoline or diesel. Combustion engines are notoriously inefficient. So while there might be a lot of energy per gallon of that liquid stuff, a typical car combustion engine can only convert about 1/3 of that energy into useful work. Electric motors are more like 90% efficient. You'd be far better off comparing cost/mile.
dhanson865
Well-Known Member
He didn't say 82 kph, he was talking gross weight of 82k.
With Tesla bringing a new megawatt charger to the consumer market (with Cybertruck and future products/refreshes), will this be a way for Tesla to challenge the CCS standard? CCS maxes out at 350kW and as far as I’m aware has no real pathway to get to this level. How could you keep on mandating an inferior plug standard if a new one could significantly reduce charging times?
Doing some Googling I found the Megawatt Charging System (MCS) which is currently being designed by a German company called CharIN. Maybe Tesla is trying to get a head start on the competition for this next global charging standard? Would love to hear some thoughts.
Doing some Googling I found the Megawatt Charging System (MCS) which is currently being designed by a German company called CharIN. Maybe Tesla is trying to get a head start on the competition for this next global charging standard? Would love to hear some thoughts.
Correct. You feed 1 gallon, ~40kWh, of diesel in and get 6.5 miles. You feed ~40kWh of electricity into the Tesla Semi and you get more than 20 miles.
Cost wise diesel is ~$0.80/mile. Electricity, using national average price, is less than $0.30/mile. (Wholesale could be under $0.14/mile, Supercharger rates could be $0.90/mile, so obviously you don't want to Supercharge most of your miles.)
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ElectricIAC
Good-Natured Rascal
navguy12
Active Member
All true; at 2kWh per mile and an assumed cost of 25 cents a kWh (half a**ed WAG), that would be 50 cents a mile.
If diesel is $5 a gallon, that gets you to a 10 mpg equivalent, cost wise.
That guy is so comfortable interrupting Elon and taking over, it's amazing. You don't see that often.
They worked well as a presentation team.
Stretch2727
Engineer and Car Nut
One gallon of diesel is 40Kwh. So I agree with 18-20 MPGe. 18 MPGe is more correct if you consider charging losses like the EPA does for cars.
Basically a 3x improvement in efficiency over a diesel truck.
thesmokingman
Active Member
They didn't mention amperage but definitely 1000v. Oh I'll also add that the V4 cable had to be redesigned, it's denser and watercooled.
.25/kwh is a lot more than what even California businesses pay. I think commercial rates are around .18/kWh in CA. Cheaper elsewhere of course.
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