Fuel Efficiency and the Yaris - Toyota Yaris Forums

Boost Addicted · 03-11-2010, 05:27 PM

'10) and never idle it to warm it up. The Yaris offers a low coolant indicator light in the dash panel that let's you know when it is running in its least fuel efficient state. As for idling to warm it up, remember that you're getting exactly ZERO MPG while idling.''

I also have to disagree with this lol. As you DO get zero mpg while warming up, you're getting worse fuel mileage driving it cold, especially in the winter... In the summer, not so much.

But in the winter, metal shrinks even more with the colder weather, and your tolerances are loose (eg. piston rings, oil pump gears, valvetrain) making operation sloppy, inefficient, and less resistance to wear. In addition, the coolant temp sensor will dump a bunch of extra fuel until the engine is at its operating temperature... So even though you're running rich at idle to warm it up, you're still using more fuel when driving it cold...

Ofcourse, when you measure lost MPG's when letting it warm up at idle, vs driving it right off the bat, numbers will be lower... But if you calculate volume of fuel used to warm the vehicle at idle vs. volume of fuel used to warm it driving when its cold, idle will get better mileage every time.

In summer weather its really not necessary.. But regardless of ambient temperature, you shouldn't put the car in gear untill 10 seconds after ignition to allow for oil to properly lubricate all parts of your engine

Just my .02 :)

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03-11-2010, 05:27 PM	#11
Boost Addicted Drives: 2008 Yaris 5spd, 2005 GLI 1.8T Join Date: Aug 2009 Location: Albany NY Posts: 33	'10) and never idle it to warm it up. The Yaris offers a low coolant indicator light in the dash panel that let's you know when it is running in its least fuel efficient state. As for idling to warm it up, remember that you're getting exactly ZERO MPG while idling.'' I also have to disagree with this lol. As you DO get zero mpg while warming up, you're getting worse fuel mileage driving it cold, especially in the winter... In the summer, not so much. But in the winter, metal shrinks even more with the colder weather, and your tolerances are loose (eg. piston rings, oil pump gears, valvetrain) making operation sloppy, inefficient, and less resistance to wear. In addition, the coolant temp sensor will dump a bunch of extra fuel until the engine is at its operating temperature... So even though you're running rich at idle to warm it up, you're still using more fuel when driving it cold... Ofcourse, when you measure lost MPG's when letting it warm up at idle, vs driving it right off the bat, numbers will be lower... But if you calculate volume of fuel used to warm the vehicle at idle vs. volume of fuel used to warm it driving when its cold, idle will get better mileage every time. In summer weather its really not necessary.. But regardless of ambient temperature, you shouldn't put the car in gear untill 10 seconds after ignition to allow for oil to properly lubricate all parts of your engine Just my .02 :)