This is normal. With everything cold the engine uses more fuel. Back in the days it was called a choke, now days it's done by the ECU. Still same principle or even "worse" as you have emissions to think of too. This may end up in using MORE fuel and a retarded ignition to actively waste energy to heat up the catalytic converter faster.The fuel economy gauge often shows a figure of 20L/100km in the first kilometre of driving. This seems really odd when the car is probably travelling at no more than 30km/hr
Hugh I wanted to give you an overview of the fuel efficiency on my PHEV since august of 2019....
I submitted a technical inquiry to Hyundai Australia, after discussing the issue with the local Hyundai service centre. I received only very generic, not very helpful responses so I am posting the query on the forum - perhaps it has already been raised here and someone can point me in the right direction.
I am a recent owner of an IONIQ Plug In Hybrid and I really like just about everything the car offers.
Some of my short trips around home are done with zero petrol consumption - which is in large part why I bought the vehicle, while on 2 trips to the ski fields from Sydney the car has averaged about 4 km/100km and very comfortable, too.
However, there is an issue which I hope the technical people can help me with because the guys at the Hyundai Service Centre had no answers.
On a number of short trips from home, maybe only a few kilometres the car insists on using the petrol engine in the first kilometre or so – even when the traction battery is well charged.
It is just quiet suburban driving – no hard acceleration, no hills - so there appears to be no need for the petrol engine.
The fuel economy gauge often shows a figure of 20L/100km in the first kilometre of driving. This seems really odd when the car is probably travelling at no more than 30km/hr.
Can you explain why the fuel economy figure is so poor (high) in the first kilometre of travel?
While the petrol engine usually turns off early in the trip, it means a short trip (less than 10km) can return a poor fuel economy figure of more than 8 L/100km – when it should be 0L /100km.
Examples from the car’s driving history:
• 3k trip showing 9.9 L/100km
• 2 km trip showing 6.6 L/100km
• 7 km trip showing 5.8 L/100km
• 2km trip showing 11.3 L/100km
• 1 km trip showing 15.2 L/100km
This is a big problem for me because about 50% of my driving is short suburban trips which the car should be able to do as a true EV (zero emissions).
Added to my regional driving (with car driving as a true Hybrid) I should be able to average about 2L/100 km.
On other occasions, the petrol motor is not used and at the end of my short trip the fuel economy shows 0L/100km – as it should.
This is how the car is advertised by Hyundai – and in large part why I bought the car.
So, can you please explain why the petrol engine turns on when it appears to be unnecessary – and how do I prevent it occurring.
So far, I think it may have something to do with not having any accessories running on starting – but this does not always work.
Maybe also related to charging the 12 volt battery - but why such high fuel consumption?