MG HS PHEV bad mpg
Discussion
Hello,
Inlaws bought a 2022 HS PHEV. Today I borrowed it for about 150 miles mixed driving, mostly country road 40-50mph. The battery was fully charged, by the time I finished with it, battery was 50%, but I never got more than 39mpg on my trip.
This seems pretty bad considering a Toyota Prius/CHR/Corolla hybrid will get 50-60mpg all day, with a smaller battery. Was I doing something wrong or is the HS drivetrain just bad?
Inlaws bought a 2022 HS PHEV. Today I borrowed it for about 150 miles mixed driving, mostly country road 40-50mph. The battery was fully charged, by the time I finished with it, battery was 50%, but I never got more than 39mpg on my trip.
This seems pretty bad considering a Toyota Prius/CHR/Corolla hybrid will get 50-60mpg all day, with a smaller battery. Was I doing something wrong or is the HS drivetrain just bad?
Seems strange that after 150 ish miles, you still had 50% battery charge left. Presume it was set to a mode which saves battery charge (generally so that you can use EV for urban use). Given this, it would have been prioritising using the petrol engine. MPG would have been better if it had used up all the battery, though still seems a bit thirsty.
The Toyotas referred to all run a more efficient Atkinson cycle engine, which works in tandem with (rather, relies upon) the hybrid system. The MG, AFAIK, runs a normal Otto cycle that, whilst still employing the hybrid system, doesn’t interlink the two anything like as much, and when in hybrid more functions primarily as an ICE with only the odd bit of assistance from the battery. The result is the Toyotas being much more efficient when left to their own devices, and the MG only having the edge via pure-EV running.
Tractor Driver said:
Seems strange that after 150 ish miles, you still had 50% battery charge left. Presume it was set to a mode which saves battery charge (generally so that you can use EV for urban use). Given this, it would have been prioritising using the petrol engine. MPG would have been better if it had used up all the battery, though still seems a bit thirsty.
I did check this but it was on 'Default' setting, with the medium and high settings being for saving the battery.As said above, seems strange that battery was still at 50%. Would have expected it to be at a max of about 10%.
My 225xe will always try and flatten the battery first - unless I’ve stuck the route into the sat-nav, where it’ll plan the battery usage around the route. On the types of roads you’ve mentioned lots of the trip should have been on battery to begin with. Even with engine runnning, I’m wondering if the HS doesn’t do something similar to the BM where it has battery assist to support the engine so it doesn’t have to work as hard when it is running. I’m sure I’ve read somewhere before about a HS not using its battery properly.
My 225xe will always try and flatten the battery first - unless I’ve stuck the route into the sat-nav, where it’ll plan the battery usage around the route. On the types of roads you’ve mentioned lots of the trip should have been on battery to begin with. Even with engine runnning, I’m wondering if the HS doesn’t do something similar to the BM where it has battery assist to support the engine so it doesn’t have to work as hard when it is running. I’m sure I’ve read somewhere before about a HS not using its battery properly.
Was it cutting the ICE when you were off throttle or on low throttle loads, allowing the e-motor to take over? I know some PHEV systems don’t do this, so the mpg can be a bit crap.
VW group PHEVs have a third clutch that decouples the drivetrain from the wheels, allowing it to coast, resulting in better mpg - this was first pioneered in their XL1. In my Audi A3 etron I’d get around 60 mpg on such a trip.
VW group PHEVs have a third clutch that decouples the drivetrain from the wheels, allowing it to coast, resulting in better mpg - this was first pioneered in their XL1. In my Audi A3 etron I’d get around 60 mpg on such a trip.
Battery range is supposedly 32 miles, so using that 50% of battery might make about 10% improvement to the apparent MPG?
Likewise, starting and finishing with the same state of charge, you'd perhaps get about 10% worse MPG over 150 miles?
Call it about 34 mpg?
It's an SUV, it will have a fair amount of air drag.
The pure petrol version has a claimed combined MPG of 37mpg.
Varied driving around A and B roads it's not out of the range of what you'd expect?
Unless you're testing from brimmed to brimmed, it's meaningless anyway, and I know from my own car that I can get quite different mpg on different roads, even without doing anything urban or mixing with heavy traffic.
Different drivers will get different MPG from the same car in real driving, maybe the OP not being used to the car, he got less mpg?
Maybe it's not the greatest of phevs?
So it's just one data point with a big dose of 'random noise'.
At that rate, I estimate the petrol range to be about 280 miles, which I rate as 'low enough to be annoying'!
Where a PHEV scores is where a lot of shorter trips are a high % of electric mode.
I'll swap my shed for it if you like?
Likewise, starting and finishing with the same state of charge, you'd perhaps get about 10% worse MPG over 150 miles?
Call it about 34 mpg?
It's an SUV, it will have a fair amount of air drag.
The pure petrol version has a claimed combined MPG of 37mpg.
Varied driving around A and B roads it's not out of the range of what you'd expect?
Unless you're testing from brimmed to brimmed, it's meaningless anyway, and I know from my own car that I can get quite different mpg on different roads, even without doing anything urban or mixing with heavy traffic.
Different drivers will get different MPG from the same car in real driving, maybe the OP not being used to the car, he got less mpg?
Maybe it's not the greatest of phevs?
So it's just one data point with a big dose of 'random noise'.
At that rate, I estimate the petrol range to be about 280 miles, which I rate as 'low enough to be annoying'!
Where a PHEV scores is where a lot of shorter trips are a high % of electric mode.
I'll swap my shed for it if you like?
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