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Old 01-29-2011, 09:54 PM   #1
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New member-Yaris automatic

Hi everyone,
New member here. I really want to maximize my mpg in my new 2010 Yaris, and have been averaging a disappointing 30mpg on my first few tanks of gas. Can anyone give me several simple hints at saving gas in my automatic? Kind of regret not getting a manual, but what is done is done.
Thank you.
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Old 01-30-2011, 07:51 AM   #2
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Re: New member-Yaris automatic

Welcome, bentjazz. If you're making short trips in cold weather, 30 mpg may be all you can expect to get until Spring and Summer come. I rented a Yaris automatic in New England for a week, and averaged 42 mpg for three tanks.

Keep your maximum speeds down - 55 or 60 mph on slower highways always beats 70 mph on the interstate. 40 mph on a frontage road will average 50+ mpg.

Coast as much as possible. Most people still have their foot on the gas half a block from red lights and stop signs. I start coasting to them 3 or 4 blocks away - in neutral, so my engine is turning 750 rpm instead of 1500 rpm.

Plan your routes to minimize stops. Even with our fuel-sipper 1NZ-FE engines, starting from a stop nets <10 mpg going to the next stop sign 2 blocks away. If you minimize those stops and starts, you can get that 50 mph cruising mpg, instead of that 8 mpg stoplight drag race wastage.

If your Yaris doesn't have an instantaneous mpg meter built-in, consider getting an Ultragauge for $60.
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Old 01-30-2011, 08:32 AM   #3
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Re: New member-Yaris automatic

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Originally Posted by SentraSE-R View Post
I start coasting to them 3 or 4 blocks away - in neutral, so my engine is turning 750 rpm instead of 1500 rpm.
Would a Yaris have aggressive enough DFCO that it's better to stay in gear?
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Old 01-30-2011, 08:47 AM   #4
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Re: New member-Yaris automatic

i've often wondered that. i've been experimenting w/ my AT. it seems on a flat surface, there is little or no difference in my coasting length.
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Old 01-30-2011, 08:49 AM   #5
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Re: New member-Yaris automatic

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Originally Posted by theholycow View Post
Would a Yaris have aggressive enough DFCO that it's better to stay in gear?
I don't know, as I didn't bring my Scangauge along when I rented that Yaris. Based on how aggressive DFCO is on my xB (kicks in >1500 rpm), staying in gear might be viable in an AT Yaris.
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Old 01-30-2011, 11:12 AM   #6
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Re: New member-Yaris automatic

"...new 2010 Yaris" ...have been averaging a disappointing 30mpg on my first few tanks of gas."

Engine break-in miles often return lower efficiency, with any luck yours may improve. Any members with personal experience?
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Old 01-31-2011, 05:28 AM   #7
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Re: New member-Yaris automatic

Hi everyone,
Thanks for the welcome and advice. Just filled up today and got 29.5mpg on the last tank. Filled my tires to 41 psi the other day, so we'll see what happens.
I'll keep the forum informed.
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Old 01-31-2011, 05:29 AM   #8
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Re: New member-Yaris automatic

By the way, what is DFCO? I've tried reading about it, but can't quite figure it out. Can anyone give me an easy explanation?
Thank you.
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Old 01-31-2011, 06:20 AM   #9
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Re: New member-Yaris automatic

Deacceleration fuel cut-off, its just when you take your foot off the gas and let the engine coast down, without using your brakes..
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Old 01-31-2011, 06:54 AM   #10
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Re: New member-Yaris automatic

DFCO is when the computer turns fuel off entirely while you're in gear and decelerating with the throttle closed. There are a lot of conditions that the computer considers when it decides whether or not to DFCO, and without equipment to tell you it can be hard to know your car's DFCO behavior. If you do know it then you can save fuel when you're planning to slow down.

I used to just assume that it would always DFCO when above 1000RPM in gear with my foot off the gas, but reality is nowhere near as simple and I wasted a lot of fuel until I learned that.
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