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Driving on the motorway

Thu Apr 11, 2013 1:41 pm

I was brave enough to take the i-miev on the motorway today and got her up to 77mph!
I drove about 10 miles mostly at around 70mph. It certainly attracted attention as I have put a sticker on the back which say 100% electric!
I cannot say I will be doing this regularly as it decimates the range. Still, it was fun.
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Re: Driving on the motorway

Fri Apr 12, 2013 1:06 am

I might have to try taking mine out onto the rollercoaster that is the A30 - there's no way mine would make it to a motorway from here. It would be fun to see how fast it goes down one of the steep sections, but maybe a worry getting it back up to the top...
Keith B.
driving with the power of 15.667 kettles

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Re: Driving on the motorway

Fri Apr 12, 2013 5:10 am

Gentlemen, allay your fears. I drive mine on the motorway/highway all the time getting into New York CIty. Average speed around here is in the upper 60's to low 70's.

Also we have some highways with climbs up some significant hills and I still can gain speed while going up, though somewhat slowly. Happy driving!
Driving Electric since 2007: Vectrix VX1 - 2007-2010, Zero S ZF9 - 2012-Present, Mitsubishi iMIEV - 2013 - 2015

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Re: Driving on the motorway

Fri Apr 12, 2013 9:59 am

It will do 81/82 mph easily. Doubt it would go any faster downhill because the motor is limited to 9900 RPM. How fast it will go UP the hills will surprise you (and everyone around you) too . . . . it's no slouch by any means

But . . . . as you say, it sure eats up the battery doing so!

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Re: Driving on the motorway

Fri Apr 12, 2013 11:03 am

I love driving the highway when there is a traffic jam. My batteries will last longer :)

Had a dream - we are getting a CHAdeMO. Hope the dream comes true. I'd love to more often use the highway.

Highway plus hill is a combination I dont like. Had to drive them. Uphill took a lot of battery but downhill still consumed energy. I did not expect pulling a truck at its tail would save me that much energy but yes it did. Even allowed more than 100 kilometers per hour and keeping the needle in the green.
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Re: Driving on the motorway

Fri Apr 12, 2013 11:27 am

Indeed- I and my i live in a hilly area, where large trucks often are slowed to 35 mph climbing the highway. That's within the torquey 'sweet spot' of our motors, so the i and I enjoy rocketing out into the passing lane to blast by those behemoths...

I haven't yet found a steep enough hill to disprove this, but at 70-80 mph on a steep downgrade, the car does not accelerate in N due to aero drag.

Hmmm, now wondering if a streamlined i coasting downhill would 'hit a wall' past 82 mph and start computer-imposed regen to prevent motor overspeed...(a leading killer of golf cart motors)

lets see, putting our cars specs into yields a terminal velocity of 279 mph! Of course, it would either invert or start tumbling after dropped from a helicopter, like this unfortunate bug that got squashed, totally destroying the calculation and topping out around 125 mph...
it's enough to make one want to head for the salt flats....
2012 i-SE "MR BEAN" 110,300 miles
2016 KIA SOUL EV, 90 kW, 27 kWh, 34k miles
2000 Mazda Miata EV, 78 kW, 17 kWh
1983 Grumman Kurbwatt EV,170 kW, 32 kWh
1983 Mazda RX-7 EV 43 kW 10 kWh
1971 "Karmann Eclectric" EV 240 kW 19 kWh

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Re: Driving on the motorway

Fri Apr 12, 2013 11:42 am

I noticed by staying behind a large semi truck at 60MPH, I was using about the same power as I would at 45MPH. Drag is a drag. :lol:
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Re: Driving on the motorway

Fri Apr 26, 2013 11:27 am

Anyone know of a cruise-control option? It's the only thing that I miss on the i.
Weapons of less consumption

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Re: Driving on the motorway

Fri Apr 26, 2013 10:41 pm

I drive on the freeway every weekday. There's really no practical way for me to get to work without doing so, and while I could go out of my way and do a little more city driving, I figure it's better for the image of the car if I just drive it how I want to drive and only worry about extending the range when I really need to.

My drive is 14 miles each way, less than 2 of which aren't freeway. I have made the outgoing trip in two bars drafting a semi truck, but usually I use three or four. The return trip, which must be more uphill, and usually is in clearer traffic, drains a little more. in general I'm out about half a charge, give or take a bar, and my RR ranges from 59 to 72. (There aren't a lot of restaurants nearby, so if I go out to eat I can put another 10 miles on the thing.)

I usually drive in the mid-60s to 70s unless I'm consciously trying to conserve, with rush hour congestion sometimes helping me limit my battery drain. I have easily gone up to 75 without even trying or realizing I was going that fast. I have not attempted reach a maximum speed, but have definitely hit 80 before.

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Re: Driving on the motorway

Sat Mar 08, 2014 8:47 pm

I took the highway today, following a flat-bed big truck doing about 60 mph. On the level spots, the needle was in the little green spot between ECO and the black "zero energy" point :!: Going downhill, I applied a little regen at the top of the hill, then coasted all the way down, plus about half a mile on level and stayed with the truck. I drove 34 miles and used 6.12 kWh, an astounding 5.55 miles/kWh. RR was 49 when I entered the highway, and after coasting down the hill, was 52. It stayed at 49 miles RR all the way until just before I started down the hill, when it temporarily dipped to 48.

I would've never thought that driving that efficiently on the highway could be possible.
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