WetEV
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Re: YMMV

Sat Sep 09, 2017 11:07 pm

Zoomit wrote:400 miles should be achievable at about 35 mph for 12 hours.


I suspect you will run out of battery first.

The above attempt was at 42 km/h, or 26 mph. Slower = better miles per kWh, at least down to sub 20 MPH.

Notice that mileage was 387miles/57kWh= about 6.8 miles per kWh.
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Re: YMMV

Sun Sep 10, 2017 5:42 am

The video of the Opel Ampera showed the speed at a consistent 42 kmph (about 26 mph).
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sgt1372
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Re: YMMV

Mon Sep 11, 2017 3:21 am

oilerlord wrote:The only way to really know your maximum range / personal best is to drive it.


That's precisely what I'm doing.

I have been driving the car normally on local roads in normal traffic w/in 10-15 mph of the speed limit and at no more than 50 mph.

The only thing "different" I'm doing is NOT driving on the freeway (where I can't keep myself from driving at 80 mph in the fast lane) and keeping my AC off.

The main reason that I'm keeping the AC off now is to compare the same use with the AC "on" later to see how much of a difference it makes. It's not scientific but it should be a worthwhile comparison nonetheless.

Anyway, I'm almost near the end of my current test.

I'm up to 295 miles of estimated range (200 driven with 95 miles & 35% SOC remaining. Still hoping to get to 300 combined at 20% SOC b4 the next recharge.

When I've driven on the freeway, the best I have gotten has been around 130 miles driven w/70 miles and only 20% SOC remaining.

So, if I can get to 300 at 20% that would be a 50% improvement in range and performance.
Last edited by sgt1372 on Mon Sep 11, 2017 10:39 pm, edited 1 time in total.
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oilerlord
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Re: YMMV

Mon Sep 11, 2017 5:59 pm

sgt1372 wrote:

So, if I can get to 300 at 20% that would be a 50% improvement in range and performance.


My previous personal best on 25 kWh's was 114 miles - about 4.6 miles/kWh. The biggest "aha" moment I've had with my EV is understanding how little energy is recovered from regenerative braking, and why it should be just referred to as "braking". I used to think I could keep the needle between consumption and regen as a "coast", but it really isn't possible to do it on a consistent basis.

Now I coast in N when possible. My EV glides for an unbelievably long distance - much farther than any of my other cars in N. 5+ miles per kWh is now pretty easy to achieve while tooling around the city (without pissing off others behind me). Stay off the brakes, and coast in N, and you'll easily hit 300 miles.
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michaellax
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Re: YMMV

Wed Sep 13, 2017 9:40 am

It only matters what you have actually driven on your charge and not what is remaining on the "estimated charge." Adding the two is a false test of how far you can actually drive.

Zoomit
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Re: YMMV

Wed Sep 13, 2017 5:18 pm

WetEV wrote:
Zoomit wrote:400 miles should be achievable at about 35 mph for 12 hours.


I suspect you will run out of battery first.

The above attempt was at 42 km/h, or 26 mph. Slower = better miles per kWh, at least down to sub 20 MPH.

Notice that mileage was 387miles/57kWh= about 6.8 miles per kWh.

https://electrek.co/2017/09/13/chevy-bolt-ev-travels-750-km-466-miles-single-charge/

If I did the math conversion correctly, 7.8 kWh/100km = 8.0 mi/kWh. So 400 mi would be possible around 35 mph.
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oilerlord
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Re: YMMV

Wed Sep 13, 2017 6:09 pm

I think your math is a little off. The guy in the video drove 387 miles on 57 kWh...at 26 mph. That yielded about 6.8 miles / kWh. Driving at 35 mph introduces some drag into the equation, so your suggested speed will be less efficient, not more. I'm guessing that extra 9 mph would reduce efficiency down to ~6 miles / kWh, so total range would end up being 360 miles or less.
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Zoomit
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Re: YMMV

Wed Sep 13, 2017 10:10 pm

I'm guessing you didn't click on the link that describes the 469 mi test.
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oilerlord
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Re: YMMV

Wed Sep 13, 2017 10:12 pm

You are correct, my bad.
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sgt1372
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Re: YMMV

Thu Sep 14, 2017 3:45 am

So, I just finished my driving range experiment.

I didn't top 300 miles but I got it up to 295 (200 miles driven/95 estimated remaining) for awhile b4 I took the car on a 20 mile back road drive at speeds 55-60 mph which immediately dropped the range by 5 to 290 (220/70).

Some more slower speed in town driving got it back up to 292 (242/50 w/20% SOC remaining). Just finished the recharge and the new estimate is 267. The last recharge was exactly 30 days (1 month) ago and the estimated range then was only 190.

So, I increased my previously typical combined in-town/freeway range of 200 (130/70) by about 50% by just driving on local town roads, keeping my speed below 50 mph for the most part and leaving the AC off. This is also 23% more than the total advertised range of 238 estimated miles.

No question that the "best use" of the Bolt for me is to restrict it to in-town driving at or below 50 mph (which is the highest posted speed limit on the various streets/roads that I drive locally). So, that's what I'm going to do from now on.

All freeway and high speed driving will be done in one of my other vehicles.
My vehicles:

2017 Chevy Bolt
2012 Mercedes ML350 4Matic
2008 BMW 335i
2002 Toyota MR2 Spyder
2002 Ford F250 7.3L 4x4 Longbed Turbodiesel

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