The theory that the more cluttered the car, the more you lose in driving

While thinking "I have to clean up," I just put it off in the car.

Actually, if it is left as it is, fuel consumption, driving judgment speed, maintenance sign, loss will accumulate little by little in all 📕

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▷ With 100 kg of luggage, fuel consumption disappears "3,500 yen a year" 🫥

According to data from the Ministry of Land, Infrastructure, Transport and Tourism and the Japan Automobile Manufacturers Association,

Loading 100 kg of luggage in a car reduces fuel consumption by 3.0% (based on urban driving)

If you run 10,000km a year in a sedan (fuel consumption 15km / L),

Gasoline 170 yen / L conversion, annual loss of + 3,500 yen.

If you leave it for five years, 17,500 yen will disappear without obtaining anything.

Annual Loss by Vehicle Type and Loading 100kg

(10,000km / year, urban area, gasoline 170 yen / L)

Compact (20km / L): + 2,400 yen / year

Sedan (15km / L): + 3,500 yen / year

・ SUV (12km / L): + 4,750 yen / year

I always carry my golf bag.

"With the child's stroller on board"

"With winter tires on even in summer"

These "loads that I don't usually care about" are,

It's definitely pushing up gas prices.

By the way, by driving environment,

In suburban driving, it worsened by 5.4% with an increase of 100 kg, and it deteriorated by 3.3% at high speed.

The more stop-and-go town riders, the easier it is to be affected.

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▷ A messy car also delays "driving judgment"

This place is surprisingly unknown,

When the car is cluttered, it may fall to the judgment speed while driving

Research has shown.

According to Rosenholtz et al. 2007, Journal of Vision,

When the degree of clutter of the desk was quantified as a "clutter index,"

· Empty desk: 3.4

· Clean desk: 4.3

· Messy desk: 6.1

And rising 🪜

And the more clutter, the more time to find the desired object

Additionally it has been confirmed to be longer.

If you put this in the car,

The more things on the dashboard,

Finding the brake lights of the signs, pedestrians, and cars ahead is delayed little by little.

In another study (Strayer & Johnston 2001, Psychological Science),

When your head is filled with another task,

The probability of missing a signal has been reported to increase about twice ⤴️

And in a study analyzing accident statistics in the United States (Stuttset al. 2001),

12.9% of all accidents were the result of distracted drivers, with handling items and carrying items in the car being clearly documented as a contributing factor.

It's just a little messy.

It may be a material to shift the judgment by one beat ⚠️

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A professional mechanic says, "Beautiful cars notice before they break."

This is the story that resonated most personally.

In the words of an active mechanic who had more than 200 likes on X.

There was such a sentence.

Beautiful cars notice abnormally quickly. Dirty cars notice after they break.

The trash at your feet drowns out the noise from under the floor,

Traces of oil leaks are not visible because they mix with other dirt,

Tire pressure warning light,

Documents left on the dashboard make it invisible.

The car always shows a small sign before it breaks down.

Whether you notice it or not depends on the condition of the car.

By the way, even in academic research,

People in messy environments have improved cognitive planning, judgment, and organization.

It is reported that there is a tendency to decline

(Woody et al. 2014, Clinical Psychology Review).

Instead of being messy because you're not good at cleaning up,

"Because I spend a lot of time in a messy environment, my judgment also falls in conjunction."

The story of the direction.

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▷ What pattern is your car?

[Pattern A: Under-seat / Floor scattering type]

Edibles, receipts, handkerchiefs, empty containers, coins.

The type whose feet are rustling when noticed.

Major losses: poor sanitation, dust in air conditioners,

Professional room cleaning fee (from 10,000 yen) is required.

Many patterns in the family layer.

[Pattern B: Dashboard scattering type]

Documents, sunglasses, smartphone holders, stuffed toys, deodorant,

Car verification holder, opened envelope...

"Because I use it often," it piles up before I know it.

Major losses: Risk of objects flying forward due to sudden braking,

Visibility worsens due to reflection on the windshield,

This is where the Rosenholtz study's "clutter index" rises the most.

Easy to delay in finding signals and pedestrians.

[Pattern C: Trunk always loading type]

Golf bags, camping equipment, empty plastic bottles,

Jackets you no longer wear, chains out of season.

Major losses: This pattern is the most directly affected by fuel efficiency deterioration.

The number of "sedan 3,500 yen per year" introduced on this slide

They almost get on.

It is calculated that 17,500 yen will disappear in 5 years and 35,000 yen will disappear in 10 years.

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People who drive beautiful cars are not important.

It is really natural that the car is messy on busy days 📝

Just once a month for 10 minutes.

Just put out "unused items" from the passenger seat and trunk,

Signs of fuel consumption, judgment speed, maintenance,

Everything is getting closer to "noticing car" little by little ✍️

Not "I have to clean up"

"I want to drive a car that notices, so I'll just trim it a little."

I want you to switch to that idea.

There is a correct answer for each person to keep the car clean.

I think that "the driving environment I chose" is the most convincing form.

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Supplement to source

Rosenholtz, R., Li, Y., & Nakano, L. (2007), Measuring visual clutter, Journal of Vision, 7 (2), 17.

Strayer, D.L., and Johnston, W.A. (2001), Driven to distraction: dual-task studies of simulated driving and conversing on a cellular telephone, Psychological Science, 12 (6), 462-466.

Stutts, J.C., Reinfurt, D.W., & Rodgman, E.A. (2001), The role of driver distraction in crashes: An analysis of 1995-1999 Crashworthiness Data System data, Annual Proceedings of the Association for the Advancement of Automotive Medicine, 45, 287-301.

Woody, S.R., Kellman-McFarlane, K., & Welsted, A. (2014), Review of cognitive performance in hoarding disorder, Clinical Psychology Review, 34 (4), 324-336.

・ Ministry of Land, Infrastructure, Transport and Tourism / Japan Automobile Manufacturers Association Fuel efficiency evaluation data (fuel efficiency deterioration rate when vehicle weight increases by 100 kg)

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