Do you get about 4 MPG less during winter ? - Toyota Yaris Forums

05-18-2009, 10:47 AM

#19

TheSilkySmooth

Drives: 08 3DR 5M Bayou Blue; 09 Fos

Join Date: Oct 2008

Location: New Hampshire

Posts: 622

Quote:

Originally Posted by 07WYarisRS

. ... Even at idle when the engine is warm, the engine still uses a lot more fuel when air temps are cold because of the much higher oxygen levels.

If you have higher oxygen contenet at given throttle opening, then ECU add fuel to compensate, then you have more heat energy, then the engine idles faster, then the ecu closes the throttle some to lower RPS count. This reduces air flow and reduces fuel utilized. and you are back to stasis.

Last edited by TheSilkySmooth; 05-18-2009 at 10:48 AM. Reason: sp

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