Forester e-Boxer fuel economy – long term consumption data

It is very interesting topic to discuss about the Subaru’s first hybrid Forester fuel consumption or MPG if you will. Just looking at the official WLTP numbers, it seems that Subaru did not make super efficient car. Combined WLTP fuel consumption is 8,1 litres per 100 km. Bear in mind that this is done in certain temperature and official WLTP cycle just little over 20 kilometers. So driving in different temperatures, it is expected to have different results. Of course, colder it is, worse the fuel economy will be. Tank capacity is 48 liters. Depending of your driving style and conditions, cruising range is somewhat 500 km.

Winter fuel consumption with the Forester e-Boxer

Fuel I use is 95 octane E10 (max 10% of ethanol). My Forester is equipped with Continental Viking Contact 7 winter tires (non studded). Tires will give own “spice” to consumption. My usual driving pattern is roughly 8 km trip to work. It is far from optimal for the car. Actually it might be even near worst possible. Lot’s of cold starts for the engine does not make good for the car nor for the fuel consumption. Every now and then I have to travel during office hours. So there I will have long distance driving. Then of course during leisure and weekend trips, with my family, consists both short and long distance driving. So this in mind I will predict the whole year consumption to be 9 liters per 100 km. This is only a guess or assumption at this stage. I will update this blog post at least every month with new consumption figures. At the end of year we should have a nice table of the Subaru Forester e-Boxer fuel economy. So, please remember to check this blog every now and then!

January

This was only half month what comes to the driving. I received car mid January, brought it to home from the dealership. First 500 km was long distance driving. Speed limits from 60 to 100km/h. During that trip fuel consumption was 7.1 liters per 100 km. Outside temperature was few degrees over 0 Celsius by then. Next I had some short distance driving. To work, back to home, to the grocery shop, etc.. That increased consumption to 8.4 liters per 100 km. Few longer work trips via a highway. Some city driving with lot’s of traffic lights. Total 1478 km distance driven. Average temperature for January +3 Celsius (Helsinki) and average consumption was 8.2 liters per 100km.

February

February started with a bit colder temperatures. That was shown as slightly increased fuel consumption. Nothing major. On this month I decided to do a “hypermiling test“. My goal was to beat official WLTP figures. Test went quite fine indeed, given that it was conducted during winter time. Result for that 60km test was 5.7 liters per 100km.

During this month GPF orange warning light lit also. Luckily I managed to get rid of that driving in certain conditions. Please check separate post of it.

Otherwise February included some driving through storm, some longer business trips and then short distance driving between home and office. Roughly 400km more than in previous month. From weather wise this month was bit colder than January, average of 1.4C. We saw even a glance of snow.

March

March started with some business related trips, which generated kilometers to the odometer. However from mid month we got advise from the employer to stay home and quickly after also from the government similar advises due to the domestic (and global) virus issue. So in March it seems that there is less distance driven and in general shorter distance driving, which increases fuel consumption.

Summer tires was changed on 24th of March. So that is also interesting to see how those will affect to the consumption. Winter tires are inch smaller than the original 18″ wheels.

I would assume that upcoming summer months will have still lower consumption figures. Bigger tires will increase consumption but warmer weather does have a greater impact. Thus lower fuel consumption is expected.

Final fuel consumption figures of March coming soon.

Monthdistance driven (km)liters / 100 kmUS MPGUK MPGAvg. outside temp.Tyres
January14788.228.734.5+3C / 37.5Fwinter
February18438.328.334+1.4C / 34.5Fwinter
Marchwinter/summer

13 comments

  • Same consumption, from 7,1 – 10,5 l / 100 km depending where, how long, etc. Average is about 8,1 – 9,2 l. Also, as warning light of low fuel level start somewhere when 7 l left, you could end up even not reaching 500 km distance. Are you using E95 or E98 fuel?

    Have you figured out in what occasion hybrid electric motor starts? For me it seems very chaotic, some days it only kicks in when accelerating. The other day in starts even in 80 km/h when lifting gas pedal and goes on full EV until you step on again. Then you can go slow in muddy road only on EV. Just have’t figured out what conducive habits are.

    Liked by 1 person

    • I am using 95 E10 fuel (max 10% ethanol) as it is little cheaper than 98. I have not used MFD screen at all to monitor when electric motor does something. For me it has been surprise that it goes to full EV mode quite often. Didn’t quite expect that. Thought it would be working on the background mainly. I guess chiller temperature might have something to do with the behavior you described? I bet during summer it is more refined.

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  • I am purchasing a hybrid Forester in about 4 weeks – I would have thought short trips or driving in the city with traffic lights and roundabouts etc would give the Forester a chance to utilize the small battery more often? I have another question for the fuel consumption on longer trips – what speeds are people going and are you on a freeway where the speed is constant for a long period of time? I am sure 90kmph will deliver improved fuel consumption over 110kmph. I am in agreement that in summer the air con will not be working as hard and possible give the electric motor more chances to engage.

    Liked by 1 person

    • On freeway I get 7.4 at 100km/h speed. City driving is the worst what comes to consumption. Roughly 9 liters per 100km. Hybrid system utilizes electric motor in most situations. It only does it in together with gasoline engine. So it is not so easy detect. Electric only situations occurs often when approaching e.g. red lights.

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  • I’ve driven some 5000 km now, and get 9 litres to 100km. Good enough, the car is thirsty because of the symmetrical all-wheel drive but that translates into super safety in bends, through water, and of course when engaging in fun off-road adventures.

    Like

  • Hi
    As I also searching for a very solid & safety car, I found this very interesting page. Congratulation for your hobby and for your time you put here!

    Because I want to buy the car for mainly highway driving, can you please share the consumption experience when driving only on highway at around 130 – 140 kmph? I will use the car for long distances (1000-1500 km one drive) with 80-90% highway … and I expect not an acceptable consumption comparing with a normal 2.0l diesel.

    thank you upfront for your feedback, Catalin

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    • We have winter speed limits at the moment. So maximum speed is 100km/h. But even during summer limits I would not drive that fast. Consumption could be easier near 10 litres per 100km. Diesel car would be far more economical option for your case.

      Thanks for the feedback!

      Like

  • Hi, I have a question about eyesight system.
    Have you had the opportunity to try it?
    How do you rate him?

    And another question about e-boxer. Are there any jerks when switching on or off the electric motor?

    Like

    • Eyesight is considered to be one of the best systems at the moment. I am very happy of it.

      Switching between electric and gasoline is very smooth on the go. But when standing still e.g. in traffic lights it is noticeable

      Like

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