Impressed by the range and mls/kWh

[EvTek23]

I often use my car (Trophy LR) for 100 mile journeys, but for convenience charge before my return so not really showing the true range and economy.
So today I was seriously impressed on my 190 mile round trip when the car returned 4.75mls/kWh over mixed driving, a significant distance of which was on the M40 (around 132 miles in total). Starting the day charged to 100%, after 5 hours of motoring I arrived home with 32% remaining and the GOM predicting a further range of 88mls having used 40kWh of battery.
What is more impressive is if you convert the mls/kWh to eMPG as an ICE comparison then we get a truly remarkable 187.8MPG. Now that is in the realms of those covered in aero tricycles trundling round a test track to try and crack the 200MPG figure, but now we're talking about a mass produced family car, that's how far technology has moved on.

 

[haloweenhamster]

Mine is generally around 2.0mile/kWh, approx 120 miles for a full charge for a T LR

Even driving eco getting 230 miles per charge, on a 700 mile trip charging publicly it cost around the same per mile as my 2L turbo petrol, about twice that of my wife's 1.6L diesel

 

[Bam Bam]

Mine is generally around 2.0mile/kWh, approx 120 miles for a full charge for a T LR

Even driving eco getting 230 miles per charge, on a 700 mile trip charging publicly it cost around the same per mile as my 2L turbo petrol, about twice that of my wife's 1.6L diesel

How come yours is so bad?

I'd expect to get around 3.8-4.5 in the Summer and 2.8-3.5 in the winter.

Is there an issue with the car or do you have a particularly aggressive driving style?

 

[enragedbadger]

What is more impressive is if you convert the mls/kWh to eMPG as an ICE comparison [...]

How do you do this?

 

[haloweenhamster]

How come yours is so bad?

I'd expect to get around 3.8-4.5 in the Summer and 2.8-3.5 in the winter.

Is there an issue with the car or do you have a particularly aggressive driving style?

Lives in sports mode & still a little slow on acceleration, my ice car had a noticeably quicker 0-60

 

[decrep]

How do you do this?

I'm just guessing here, but I think first of all you have to convert kWhs to the equivalent energy in a gallon of petrol. Is that in Joules??? Or am I getting mixed up with something else?

edit, just found an online converter, 1l petrol = 9.5kWh.
I'm getting about 13kWh/100km.
Equivalent l/100km is 1.4.
My ICE wagon gets around 8l/100km, so that's around 5.5 times better

 

[Tuareg]

I'm currently getting a long term average (over the last 6000kms), 14.8kWh/100km which is 6.76km/kWh or 4.2mls/kWh on my Xpower.

 

[EvTek23]

@enragedbadger, you can look up (Google) the equivalent energy of 1 litre of petrol which is generally accepted to be 8.9 kW in electrical terms, although the figure varies between petrol and diesel.
So for my example it is the energy consumption taken from the infotainment system display, 40kW X 8.9 = 4.494 Litres equivalent petrol for 190 miles (again in my example). Again look up the conversion from L to gallons which is 4.546, then convert from litres to gallons 4.494 ÷ 4.546 = 0.9886 gallons.
Finally multiply the milage 190 (for my example) by the equivalent petrol which is 0.9886 which then gives 187.8 eMPG.
There probably is a converter out there that if you put in energy consumed in kW, and milage it will do it all for you. Check though that it's not US based as the US gallon is a different amount from an Imperial gallon.

 

[decrep]

Just to be a pedant, energy is kWh, not kW, that's power.
And I get 1l petrol is
"1 litre of petrol contains approximately 32 to 35 megajoules of energy."
and I get 34 megajoules = 9.44 kWh.
Where did you get the 8.9 figure?
I think you're cutting yourself short, could be getting closer to that 200mpg you dream about.

 

[haloweenhamster]

Imo that's an irrelevant figure whereas miles/km per £/€/$ for all vehicles is relevant

 

[decrep]

Imo that's an irrelevant figure whereas miles/km per £/€/$ for all vehicles is relevant

But that's very variable, depending on all sorts of factors,
Different ways of looking at things, depending on your perspective.

In the long term, relevant efficiency of energy conversions is relevant, and electricity is much more efficient than chemical. Nuclear is probably the most efficient, but I don't want to go there.

 

[siteguru]

Nuclear is probably the most efficient, but I don't want to go there.

If you're talking nuclear fuel to electricity conversion, then nuclear is not that efficient as it still uses steam turbine generators ... nuclear fission produces heat to boil water into steam, which then turns turbines connected to an electrical generator. So nuclear is more efficient than coal, oil or gas (which also use steam, although gas can be used directly), but maybe not as efficient as wind.

 

[haloweenhamster]

But that's very variable, depending on all sorts of factors,
Different ways of looking at things, depending on your perspective.

In the long term, relevant efficiency of energy conversions is relevant, and electricity is much more efficient than chemical. Nuclear is probably the most efficient, but I don't want to go there.

But so is mpg; wind, gradient, road surface, tyres, driving style etc can all effect it
My old car I could get from 12mpg to 40mpg

 

[Caramaddy]

As a rough guide, take your miles per kWh figure - e.g. 4.1 and multiply it by 40. This gives the overall mpg.
Example: 4.1 miles/kWh x 40 = 164 mpg.

 

[EvTek23]

@Caramaddy, yep, my figure of 4.75 mls/kWh X 40 = 190. (My long winded multiple conversions gave 187.8 eMPG) That's close enough. I knew there'd be a simpler method. Thanks.

 

[JonnyG]

As a rough guide, take your miles per kWh figure - e.g. 4.1 and multiply it by 40. This gives the overall mpg.
Example: 4.1 miles/kWh x 40 = 164 mpg.

Well I've learnt something new today .... as I never knew that !!

Even my 3.0 mls/kwh looks good at 120mpg with all that performance on tap

 

[haloweenhamster]

Even with your 120mpg/190mpg it's still more expensive than a 25mpg petrol ice car when both are filled publicly

 

[Kithmo]

I'm not interested in mpg, more so pence per mile.
The Toyota Prius I had averaged out at 14p/mile, my MG4 averages out at 3.7p/mile.
This is almost all short trips og 3 miles each way, charging at home (all 7kW) and including some free electricity from EDF's Sunday saver scheme. I don't know of any petrol stations that give away free petrol or diesel.

 

[JonnyG]

Even with your 120mpg/190mpg it's still more expensive than a 25mpg petrol ice car when both are filled publicly

With newer EVs having longer and longer ranges I wonder if the demand for public charging may eventually plateau and then fall slowly after EV adoption has reached its peak ?

Take my example - my new EV coming next week (an ID7) has enough range to mean I will hardly ever have to public charge for my usual long haul round trips of 220 and 240 miles to my family members, even in Winter. Currently I have to do a public charge for these trips when we stop for a comfort break and incur the high charging costs.

 

[dsr]

Even with my current ER, I have only used fast chargers three times in two years. I have no doubt that advances in battery design will soon make 300 real summer miles the norm and the same real winter mileage will follow. When that happens, en route charging will inevitably become something of a rarity, although those whose destination is away from home will still need some form of charger.