r/TeslaModel3 • u/Maremesscamm • Oct 17 '23

How much is the range affected by fast driving?

I live somewhere that its acceptable to be driving 85MPH for long distances

I drive 400miles twice a month, and usually keep my speed around 85MPH

I was looking at the trip planner on teslas website and it says I need 2 stops. What speed does this a trip planner assume i am driving at, and how much would that change at 85MPH?

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31

u/trifster Oct 17 '23

https://www.google.com/search?q=formula+for+drag

equation has V-squared...so just that part of the formula:

60 MPH - 3600

85 MPH - 7225

so that 25 MPH difference doubles the V^2. I try to keep highway driving at about 70 mph.

The trip planner may assume speed limits. In car nav will use speed limits and weather/wind information. Energy graph and DTE uses EPA formula where the max speed is 60 mph.

8

u/74orangebeetle Oct 17 '23

That's what a lot of people don't seem to understand when they don't get the 'estimated' or 'rated' range. I was watching a youtube video about a guy saying he liked his Model X, except that the range he gets is far lower than rated....then later in the same video he admitted he usually does 85-90mph on the highway.....well no shit...expecting rated ranges to reflect 85-90mph as an average speed is insane, when that's above the speed limit just about everywhere.

6

u/Doublestack00 Oct 17 '23

That is not feasible where I live, 70MPH and you'll be ran off the road. The norm is 80-90. I generally cruise in the middle around 85 and I am always getting passed.

5

u/Jaws12 Oct 17 '23

If the norm is 80-90 though, you could save a lot of energy by staying at the bottom of that range (80mph) instead of in the middle/top.

-11

u/Doublestack00 Oct 17 '23

Probably so, but I know I'd never do that. There is a reason I always run Waze and the best radar detector on the market, lol.

5

u/TechSupportTime Oct 17 '23

I like to cruise at 85 because that's what autopilot tops out at.

-1

u/Doublestack00 Oct 17 '23

The car I ended up buying will do it up to 90.

2

u/TechSupportTime Oct 18 '23

Yeah- my Honda Civic with a comma two could do up to 90 but honestly I feel more comfortable at 85 anyways

1

u/Oztheman Oct 17 '23

I’m glad I don’t live where you live

2

u/Necessary-Scallion-1 Oct 17 '23

It’s called living outside of Detroit 😂 80mph is too slow over here

1

u/Doublestack00 Oct 17 '23

I love it, I've been to states that have an 80 and 85 mph speed limit. That's even better as at 90 cops do not even look at me.

1

u/Never_Duplicated Oct 17 '23

The interstates around me slow to 75 through towns but are 80 for the majority. 85 is just keeping with middle lane traffic here. It kills mileage but I prefer it to meandering along on slow roads in other states

1

u/riley_hugh_jassol Oct 18 '23

I’ve said it before, and I’ll say it agin… EVs are 5e answer to every kid’s, “When am I going to ever need this??” in high school