1. Official fuel economy claims:

• MG claims a combined fuel consumption of 155.8 mpg (1.7 L/100km) under WLTP testing [11][9].
• The official NEDC rating is 75.2 km/L (1.3 L/100km) [1][2].

1. Real-world fuel economy:

• In real-world testing, the fuel economy is significantly lower than the official claims:
• One test achieved 18.7 km/L (5.3 L/100km) in hybrid mode with a full battery [5].
• Another test saw 11.9 km/L (8.4 L/100km) with a depleted battery [5].
• A long-term test reported 35 km/L (2.9 L/100km) on average [5].
• Most reviews suggest real-world economy between 40-60 mpg (4.7-5.9 L/100km) unless driving mostly in EV mode [13].

1. Electric range:

• The official electric-only range is 52-72 km depending on the test cycle [2][12].
• Real-world testing achieved close to the claimed range, with one test reaching 63.6 km [5].

1. Factors affecting fuel economy:

• Using climate control can cause the petrol engine to run even in EV mode [10].
• The car tends to use the petrol engine more than expected, even when set to EV mode [11][12].
• It’s more efficient on longer runs at higher speeds with fewer stops [10].

1. Battery and charging:

• The HS PHEV has a 16.6 kWh battery [12].
• Charging time is about 4.5 hours [13].

In summary, while the MG HS PHEV can achieve very high fuel economy under ideal conditions or with frequent charging, real-world fuel consumption is likely to be significantly higher than the official figures, but still better than a conventional petrol SUV. The actual economy will depend heavily on driving patterns and how often the battery is charged.

Citations:
[1] https://www.8891.com.tw/m/articledetails/2/2131
[2] https://www.kingautos.net/347509
[3] https://gooptions.cc/mg-hs-phev-%E8%80%97%E6%B2%B9%E5%97%8E%EF%BC%9F/
[4] https://www.chasingcars.com.au/reviews/midsize-suvs/mg-hs-plus-ev-plug-in-hybrid-2023-review/
[5] https://www.mobile01.com/topicdetail.php?f=1560&t=6828801
[6] https://roadtest.u-car.com.tw/roadtest/article/72476
[7] https://www.youtube.com/watch?v=-jDfXkmBDnk
[8] https://www.mgcars.com/en/mg-models/new-mg-hs-phev/overview
[9] https://www.greencarguide.co.uk/car-reviews-and-road-tests/mg-hs-phev-review/
[10] https://www.carsales.com.au/editorial/details/mg-hs-phev-2021-long-term-review-132475/
[11] https://www.mirror.co.uk/lifestyle/motoring/car-reviews/mg-hs-phev-review-comfortable-27473766
[12] https://www.drive.com.au/reviews/2021-mg-hs-phev-long-term-review-left-to-its-own-devices/
[13] https://www.fleetnews.co.uk/cars/reviews/mg-hs-phev-first-drive
[14] https://www.parkers.co.uk/mg/hs/review/mpg-running-costs/
[15] https://www.carsguide.com.au/family/mg-hs-ev-essence-p1-88076
[16] https://www.drivencarguide.co.nz/reviews/long-term-test-plugging-into-the-mg-hs-phev/