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Summary:

When newcomers get in my Prius, they always ask how it works. I show them the “energy” display screen, illustrating the interplay between the battery, the engine, and the electric motor. It’s a helpful diagram, showing what happens in real time when I start the car […]

When newcomers get in my Prius, they always ask how it works. I show them the “energy” display screen, illustrating the interplay between the battery, the engine, and the electric motor. It’s a helpful diagram, showing what happens in real time when I start the car up, accelerate, and pause at a stop sign.

But when the newbies leave I switch back to my addiction, the “consumption” display. It’s not just the fact that my car’s a hybrid that makes it more fuel efficient, it’s that it shows me my current and average MPG, sparking my competitive side to get better mileage readouts and inspiring me to last longer before my next fill-up. prius.jpeg

If my habits are at all indicative, instantaneous feedback is an effective way to inspire conservation — and hybridity has nothing to do with it. It’s been suggested to me that a real-time usage readout on my shower or thermostat might have a similar effect, and I believe it.

Not everything about my car is so useful. Besides the aerodynamic shape already making the it look like an alien car, the Prius’ interior is over-designed, with spring-loaded glove compartments, the MPH readout display practically under the hood, and a wheel-side shifter stump.

But the dashboard consumption screen is actually useful. On the far right, I see my current MPG, from 0 to 99.9 (the maximum computed, apparently). To the left of that I see my scores for the last half hour, in five minute chunks. There’s also some doohicky about how many watt-hours I’ve regenerated (ostensibly one of the key draws of the Prius) in each time period, but it’s too cryptic to motivate me.

But oh boy — when I get good MPG averages, does it make me happy (and you can see from posts on PriusChat that I’m not the only one). Once on a trip back from the mountains, easing up the uphills and shifting to neutral on the downhills, my boyfriend and I earned a full half-hour screen of 99.9 MPG averages. We whooped and pulled out the cellphone cam to capture the historic moment.

I’ve become a huge fan of coasting, whipping my foot off the gas whenever a light ahead turns yellow. And feel it in my gut when the car chugs up the hills of San Francisco — the hybrid is relatively unimpressive on the way up. My fuel efficiency, of course, doesn’t match what’s advertised — I suppose I drive a bit too fast on the freeway — but give me a 47 MPG average and I’ll call it a good tank.

Photo: Liz’s cell phone camera when she got all six bars at 99.9 MPG.

By Liz Gannes

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  1. prius’ and other hybrid’s threaten my life on a daily basis….i live on a narrow street in SF…and am so used to relying on the sound of a car coming to tell me if it is ok the jaywalk…

    hybrid’s are sooo quiet on electric power, that i liken them to my friend’s gas: silent but deadly.

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  2. Craig Rubens Monday, July 16, 2007

    My dad was also one to try to maximize his fuel efficiency by looking at the MPG read out. He still keeps a notebook in the car to record the exact price and mileage at every fillup. Having that little number there staring you in the face (and wallet) definitely changes the way you drive, even if only subconsciously. And at $3.00 a gallon I totally understand why.

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  3. I have a Highlander Hybrid and I totally agree with your thought that its not the hybridity, it is the instant MPG readout. I say all cars should have it! And yes, its a thrill to bump it more and more!

    My driving pattern has changed dramatically since I got the car a couple of months ago. I have made my other car (Acura TL-S) go 1.5mpg more than it used to!

    But what about the non-hybrid owners who complain that hybrid drivers start slowing down too early to get higher MPG readouts?

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  4. Hi:

    There have been some studies on price feedbacks and conservation for electricity consumers. Something I blogged about here.

    Cheers,
    Suhit

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  5. I never knew about that feature, but now that I know about it, I want one! I would totally be trying for the best gas mileage. It’s like a videogame that helps my wallet and the environment.

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  6. Mother Jones had a fascinating article about “hypermilers”–people who are obsessed with fuel efficiency. You can read the article here: http://www.motherjones.com/news/feature/2007/01/king_of_the_hypermilers.html.

    I blogged about this and my dream for a device in the home that accomplishes the same as the MPG displays in new cars: http://climatechangers.wordpress.com/2007/02/14/knowledge-is-conserving-power/

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  7. [...] playing a mental videogame (in some cars, like the Prius, this videogame can be surprisingly literal) where I gain points for coasting and lose points for heavy acceleration and especially braking. In [...]

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  8. [...] Me and My Prius: Data Inspires Conservation [...]

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  9. [...] only needs 9.578 gallons to fill his next tank — that equals 136.45mpg notes Calcars. Sorry Liz, efficient driving can’t compete with a plug in your [...]

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  10. Prius’s have the coolest most advanced features. The fuel consumption screen allows you to see what the optimum speed is to travel in order to save the most fuel and spend the least amount of money. There’s nothing quite like it.

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