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Mini reveals electric vehicle trial findings

Mini’s field trial of its electric Mini E have shown that the average daily distance driven was 29.7 miles with virtually all recharding carried out at home.

The field trial had 62 members of the public and 76 pool users running the battery-powered hatchbacks over two six-month periods.

The daily journey distance of 29.7 miles was slightly more than the 26.5 miles recorded by the control cars, a mix of Mini Coopers and BMW 116i models. The UK average daily distance driven for private cars overall is less than 25 miles.

With information gathered by on-board data-loggers, the average single trip distance was recorded as 9.5 miles compared to the UK average of 7 miles.

Data was collected electronically by data-loggers in the car and the home charging points, and also from driver research carried out by Oxford Brookes University.

The early findings have already informed the development of the 2011 BMW ActiveE car, a four-seat car based on the BMW 1 Series Coupe, but the biggest beneficiary will be the BMW i3, the first purpose-built EV from the BMW Group, set for launch in 2013.

Almost all participants (96%) said they’d consider buying an electric car as a result of taking part, and half (51%) revealed they would pay a third more for an EV. A third (30%) said they’d consider taking the plunge within a year, while 55% said they’d hold fire for two or more years.


The trial found that one week was all that was needed for customers to adapt to the characteristics and peculiarities of driving an EV, such as charging, range, regenerative braking and low noise. However those company car drivers invited to use the Mini E as a pool car on a less frequent basis needed increased training and support during the initial period of vehicle use in order to consolidate their learning.

Four out of five people reported that 80% of their trips could be done exclusively in the Mini E, and this increased to 90% of users saying that with the addition of rear seats and a bigger boot, all their trips could have been done in the Mini E.

84% said that the severe low temperatures during both phases of the field trial affected the distance that could be driven between charges, but despite that, four out of five participants told the researchers they thought the Mini E was suitable for winter use, with one user, Janet Borgers, saying she “regularly did 88 miles in a single journey in the cold weather”. Another female commuter clocked up almost 8,000 miles over a September to March period.

Given the daily driven distance of just under 30 miles, the drivers felt confident enough not to have to charge their Mini E every night. In fact, the average was 2.9 times a week according to information fed back via electricity smart meters, with special night-time tariffs successfully encouraging individual drivers to charge when it was cheapest.

Nine out of ten drivers told the researchers that charging actually suited their daily routine, with 81% agreeing with the statement “I prefer to plug in the car than go to a fuel station”.

Most charged at home, with 82% using their wall-mounted charging box 90% of the time.

The lack of a comprehensive public charging infrastructure in the UK was noted, with four out of five participants (82%) saying they thought that it was “essential” that a network of charging points was established. However, almost three quarters (72%) said they were able to use their car perfectly adequately right now as they had access to private charging.

Understanding that use of the regenerative braking could increase the range by approximately 15%, three quarters of the users (74%) agreed with the statement that it was “a game for me to use the regenerative braking in a way that enables me to reach my destination without draining the battery.”

Asked by the Oxford Brookes University researchers for suggestions to deal with the potential danger from the low noise at low speeds, over half (56%) said that instead of an artificial noise, the driver should pay more attention. However just over a quarter (28%) said they’d like to have a warning noise below 12.5mph.

Fleet use was a big part of the trial with organisations in the UK.

Those users who swapped out of their regular car reported that the MINI E was fine for 70 percent of journeys made during the working day, while the pool car success rate was even better with between 80-90 percent of regular trips achievable.

The speed of charging was an important consideration for fleet users, while managers also flagged up the need for a clear procedure for the efficient charging of pool vehicles. Companies that participated included Scottish and Southern Energy, Oxfordshire County Council, and Oxford City Council.

The Mini E trial was one of eight UK projects supported by the £25m Ultra Low Carbon Vehicle Demonstrator Programme, funded by the Technology Strategy Board and Department for Transport.

These are aimed at bringing forward the introduction of viable electric passenger vehicles to the UK.

Suzanne Gray, general manager of BMW i, said: “The feedback from the trial has been invaluable in helping our understanding of how people really respond to electric cars and other factors necessary to support electric car drivers.

“With this information we will be in a strong position to provide a well-rounded product and service proposition to customers of the BMW i3 and to work with other players in the electric vehicle market to make it a successful experience for a new generation of users.”

The Mini E trial in numbers:

  • 40 Mini Es
  • 12 months
  • 138 drivers (32 women 106 men)
  • 258,105 miles
  • 33,345 journeys
  • 80,282 kWh electricity
  • Highest mileage by an individual driver over six months - 7,954 miles
  • Average mileage per vehicle over six months, including fleet pool cars – 3226
  • Average cost to charge over six months - £60, less than 2p per miles

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