EVforRobert
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Re: Official Tesla Model 3 thread

Wed May 05, 2021 2:13 pm

The trip back consumed more energy because of leaving later in the day and encountering mid 90 degree temperatures and a big crosswind. Still, it only added a little to my total consumption over 1500 miles.
I don’t see any way to discover the percentage highway and city in the interface. I have taken freeway trips totaling 700 miles and the rest mixed. Still, there was a lot of thought put into Tesla’s UI/UX.
2021 Tesla Model 3 Standard Range Plus
2019 BoltEV LT bought back by manufacturer
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lpickup
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Re: Official Tesla Model 3 thread

Thu May 06, 2021 7:55 am

EVforRobert wrote:
Wed May 05, 2021 2:13 pm
I don’t see any way to discover the percentage highway and city in the interface. I have taken freeway trips totaling 700 miles and the rest mixed.
In my case my daily/local use is almost never highway (maybe about 2-3 miles a day are highway, but only one exit.

I have much better efficiency on trips than local use. I chalk this up to the car being very aerodynamic, the fact that I don't really push the speed too much (I generally set the cruise to about 5mph above), and the fact that for non-highway use, there tends to be a lot of start/stop and having to accelerate the heavy car over and over again, which winds up being more inefficient than the aerodynamic drag at highway speeds. Plus you have the inefficiency of getting the cabin to comfortable temperature at the beginning of a trip which is a larger percentage of each trip when driving locally versus a long trip. This is not technically a statement on the efficiency of the car in highway vs. city, but from a purely practical standpoint, it matters.

My lifetime efficiency (per TeslaFi) is 261 Wh/mile. But for a particular road trip I've taken 4 times now, my efficiency has been 210, 222, 222 (again!), and 265 Wh/mile. These were in July, July, September and March (hence the lower efficiency). Yes, part of that is due to the fact that two of the three were in the summer, but if for example I look at the month prior and following the 210 trip (July 2019), my efficiency was 247 Wh/mile in June and 265 Wh/mile in August. During July itself, in addition to the 210 Wh/mile trip, my local trips were 264, 253, 244, 250, 239, 229, 249, 226, 199 and 350.

Note: I put my aero wheel covers on for road trips and take them off for local.
...Lance

Deep Blue Metallic 2018 Tesla Model 3 (31849) (delivered: 7/13/18)
Coulis Red 2016 SV (312310) (bought: 12/23/16 sold: 7/5/18)
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DougWantsALeaf
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Re: Official Tesla Model 3 thread

Thu May 06, 2021 1:33 pm

For the repeated trips, would you share the rough start and end point (general metro areas) to see what the posted speed limits are for the trip?
2019 S Plus (93.86% SOH) & 2019 SV Plus (93.35% SOH) Both Silver
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lpickup
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Re: Official Tesla Model 3 thread

Thu May 06, 2021 1:49 pm

DougWantsALeaf wrote:
Thu May 06, 2021 1:33 pm
For the repeated trips, would you share the rough start and end point (general metro areas) to see what the posted speed limits are for the trip?
Metro area...that's a funny one considering the starting point!

Start is Potsdam, NY (or that general region) and end is Durham, NC, but I take I-81 all the way to Staunton, VA and then US-29 to Danville, VA and then NC-86 for the rest of the way. So the first 45 minutes is on US-11 which is 55mph speed limit except where it goes through towns. Then the next 500 miles or so are all interstate (I-81). In NY and PA the speed limit is mostly 65...MD is only 10 miles wide so we'll ignore that...WV and VA it's 70, US-29 varies...it actually goes up to 70mph for a small section, but it's mostly 55mph, as is NC-86.

If it helps, I can isolate the I-81 section (mostly) between Moosic, PA and Mt. Jackson, VA (272 miles) as I did that in one hop with 209 Wh/mile, average speed of 68mph and max speed of 77mph. Here's the link to the drive in TeslaFi: https://www.teslafi.com/shared.php?driv ... prD09kI5Av
...Lance

Deep Blue Metallic 2018 Tesla Model 3 (31849) (delivered: 7/13/18)
Coulis Red 2016 SV (312310) (bought: 12/23/16 sold: 7/5/18)
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DougWantsALeaf
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Re: Official Tesla Model 3 thread

Thu May 06, 2021 3:54 pm

209 watt hours per mile (4.8 miles/kWh) at 68mph for a relatively flat course is very good.

Even on a perfect hot humid day with neutral wind, my Leaf with aero rims would do no more than 4.4 miles/kWh or 227 watt hours per mile at 68 mph.
2019 S Plus (93.86% SOH) & 2019 SV Plus (93.35% SOH) Both Silver
2013 Leaf SV sold 2019 with 11 bars
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Max Miles on 13 Leaf: 120 miles
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lpickup
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Re: Official Tesla Model 3 thread

Thu May 06, 2021 4:20 pm

DougWantsALeaf wrote:
Thu May 06, 2021 3:54 pm
209 watt hours per mile (4.8 miles/kWh) at 68mph for a relatively flat course is very good.

Even on a perfect hot humid day with neutral wind, my Leaf with aero rims would do no more than 4.4 miles/kWh or 227 watt hours per mile at 68 mph.
Yes, I am totally amazed out how slippery this car is on the highway.
...Lance

Deep Blue Metallic 2018 Tesla Model 3 (31849) (delivered: 7/13/18)
Coulis Red 2016 SV (312310) (bought: 12/23/16 sold: 7/5/18)
Glacier Pearl 2012 SL (016138) (delivered: 12/9/11; traded in 12/23/16)
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knightmb
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Re: Official Tesla Model 3 thread

Thu May 06, 2021 8:06 pm

lpickup wrote:
Thu May 06, 2021 4:20 pm
DougWantsALeaf wrote:
Thu May 06, 2021 3:54 pm
209 watt hours per mile (4.8 miles/kWh) at 68mph for a relatively flat course is very good.

Even on a perfect hot humid day with neutral wind, my Leaf with aero rims would do no more than 4.4 miles/kWh or 227 watt hours per mile at 68 mph.
Yes, I am totally amazed out how slippery this car is on the highway.
Tesla Mode 3 drag coefficient (CoD) is 0.23, the Nissan Leaf (both generations) drag coefficient is 0.28. You can't deny physics. :mrgreen: It may not mean much below 50 MPH, but once you starting getting that exponential increase in drag at higher speeds, Tesla is going to win the efficiency game every time. ;)

I do wonder how much better the Leaf *could* improve it one had the resources and didn't care what the vehicle looked like afterwards (like no side view mirrors on the outside for example :lol: )
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lpickup
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Re: Official Tesla Model 3 thread

Fri May 07, 2021 5:15 am

Tires (and tire pressure) and other drivetrain components (motor, inverter) probably have an effect as well, although Tesla may have a detriment with their active thermal battery pack management system and greater weight (although on flat highway at constant speed, weight should not matter).

When I had my LEAF, the factory tires were able to deliver about 4.4mi/kWh (best case days), but as soon as I switched to Goodyear "eco" tires that the shop told me were specifically designed for hybrids (it was a Goodyear shop), the best I could I ever do was 4.2 kWh, and it was usually 4.0 or less. I probably wouldn't have cared too much except with my battery degradation I was needing every mile I could squeeze out of it, so I ended up going back to the factory spec Bridgestone Ecotopias at my next tire change.

I can't remember off the top of my head what tire pressure the LEAF spec'ed, but I'm thinking 35-36 psi, which at the time seemed high. My Tesla, however, specs 45 psi! I suspect that makes a huge difference.
...Lance

Deep Blue Metallic 2018 Tesla Model 3 (31849) (delivered: 7/13/18)
Coulis Red 2016 SV (312310) (bought: 12/23/16 sold: 7/5/18)
Glacier Pearl 2012 SL (016138) (delivered: 12/9/11; traded in 12/23/16)
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DougWantsALeaf
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Re: Official Tesla Model 3 thread

Fri May 07, 2021 8:31 am

Yeah, many of us run our Leafs at 44psi, which is the tire max pressure rating. Those of with a Leaf S+ and the smaller 16" tires also do a bit better as the car is physically lower to the road as a result (1/2") and both car/wheels are lighter. (Car also has lfewer electronics which has a little less overhead draw).

I am curious how much the power train efficiencies make a difference. Anecdotally, if feels like Tesla and Lesf drivers report similar efficiencies at low speeds, but guessing the Tesla drivers are driving a bit more aggressively.

The M3 efficiency at 70mph on a warm not-rainy day is certainly very impressive.
2019 S Plus (93.86% SOH) & 2019 SV Plus (93.35% SOH) Both Silver
2013 Leaf SV sold 2019 with 11 bars
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Max Miles on 13 Leaf: 120 miles
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lorenfb
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Re: Official Tesla Model 3 thread

Fri May 07, 2021 10:09 am

lpickup wrote:
Fri May 07, 2021 5:15 am
Tires (and tire pressure) and other drivetrain components (motor, inverter) probably have an effect as well, although Tesla may have a detriment with their active thermal battery pack management system and greater weight (although on flat highway at constant speed, weight should not matter).

When I had my LEAF, the factory tires were able to deliver about 4.4mi/kWh (best case days), but as soon as I switched to Goodyear "eco" tires that the shop told me were specifically designed for hybrids (it was a Goodyear shop), the best I could I ever do was 4.2 kWh, and it was usually 4.0 or less. I probably wouldn't have cared too much except with my battery degradation I was needing every mile I could squeeze out of it, so I ended up going back to the factory spec Bridgestone Ecotopias at my next tire change.

I can't remember off the top of my head what tire pressure the LEAF spec'ed, but I'm thinking 35-36 psi, which at the time seemed high. My Tesla, however, specs 45 psi! I suspect that makes a huge difference.
Forget rolling resistance?
Tires can have a major impact on electric car range. Automakers often fit electric cars with low-rolling resistance tires to maximize range, albeit often at the expense of handling, as these tires offer less grip than conventional tires. That tradeoff appears to be worth it, however.
A recent Road & Track test showed that sticky performance tires reduced the range of a Volkswagen e-Golf by nearly 20%—leading one to wonder whether they're worth the handling improvement.
https://www.greencarreports.com/news/11 ... -car-range

A calculator; https://www.engineersedge.com/mechanics ... _13633.htm
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#2 Leaf SL MY 12/18: 10.3K miles, SOH 109Ahrs/115Ahrs, 5.2 miles/kWh (average), DOD > 20%, temp < 105F

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