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I installed the K&N Filtercharger for the 2010-11 Prius and 2011 CT. My real life fuel economy is averaging 45.8 over 2200 miles, and I routinely see 46-47 mpg. I do drive mainly in ECO mode and use EV mode as much as possible in traffic.

Better airflow = better fuel economy, but theoretically there's an actual HP increase related to it. K&N hasn't published a number, but my guess is 3.
 

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I have the K&N filter installed too, right off the bat. My question is, does the 3HP increase data from because K&N ran tests between their new filter and the old factory filter that has been in the car for a few thousand miles, or does it compare a new K&N filter w/ the performace of a new factory filter?
 

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Using "EV mode"

...I do drive mainly in ECO mode and use EV mode as much as possible in traffic.
Coming from Prius, my advice to you is not to use EV mode at all in regular drive, even in dense traffic, it will decrease your mpg.
You have losses in recharging process, so you loose efficiency overall. Let the car computer make the decisions when to shut-off the ICE, it will do it much more efficiently than us weighing parameters unknown to us as ICE and battery temp, state of charge etc.
In special circumstances though, like driving in parking lot or moving the car for a short distance, especially when ICE is cold - then yes, go ahead and use the EV mode if you want.

Giora.
 

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I don't think the car lets you go into EV mode when the engine is cold. At startup, it goes through a mandatory 3-5 minute engine warm up where you can't go into EV mode. It sucks when you just want to move the car a few feet in the mornings. It's not so much an issue when you come home and have to move the car a few minutes later, since at that time, the engine is already warmed up and given that you have a moderate to full battery, EV mode will engage.
 

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Startup cold

...I don't think the car lets you go into EV mode when the engine is cold. At startup, it goes through a mandatory 3-5 minute engine warm up where you can't go into EV mode...
At startup, cold engine, don't you have 10 seconds delay before the ICE fires, in which period you can switch to EV mode which cancels the ICE firing?

Giora.
 

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Nope. The EV mode will not engage at all w/ cold engine startup until the requisite warm up is completed. Unless I've been mashing the wrong button this entire time. LOL. And believe me, I have to move my car ALL the time and wish it wasn't this way! Stupid street sweepers. LOL. I think it's a protective mechanism because the car doesn't always know whether you'll suddenly accelerate and fire up the ICE while it's cold. Now, if the engine is somewhat warm, you can definitely get away with EV mode switching on. I've also heard stories about people in really hot areas where their engines were actually warm enough from the heat that their EV modes were able to engage.

No such luck here in Southern California!
 

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Matt RN,

I guess I'll have to wait to mine (due beginning of May) to try myself...
Strange, as the Prius Gen2 and Gen3 have this delay and I see no reason why to drop this important feature on the CT.
Will you give it another try just to be sure?
 

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"EV mode" with cold engine

Nope. The EV mode will not engage at all w/ cold engine startup until the requisite warm up is completed. Unless I've been mashing the wrong button this entire time. LOL. And believe me, I have to move my car ALL the time and wish it wasn't this way! Stupid street sweepers. LOL. I think it's a protective mechanism because the car doesn't always know whether you'll suddenly accelerate and fire up the ICE while it's cold. Now, if the engine is somewhat warm, you can definitely get away with EV mode switching on. I've also heard stories about people in really hot areas where their engines were actually warm enough from the heat that their EV modes were able to engage.

No such luck here in Southern California!
Have checked this subject and it appears we are both right!
There are some design differences between the US version and the European/Japanese version, among them:
In the Euro/Japan model you can engage EV mode during the time frame from pressing START to engine firing (about 10-12 seconds) provided that the hybrid system temperature is not lower than 0 C (32 F). In the US model the lowest temperature to do this is 20 C (68 F)!

So, it's nothing to do with safety.

I wonder what version our friends in Canada get, can you engage EV mode in the morning when temp is between 0-20 C?

Giora.
 

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NOOOOOOOOOOOOOOOOOOOOOO. Us peeps in the US got jipped! darn it! We also don't get DVD playback or Mark Levinson audio. BOO.

Lucky. =p
 

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I wonder what version our friends in Canada get, can you engage EV mode in the morning when temp is between 0-20 C?

Giora.
I haven't been able to engage EV upon startup yet, I have just assumed battery has been too cold as weather has been about 10 C or the battery wasn't charged enough to do. But EV works when car has been driven for 10+min.
 

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I have noticed the same thing and I am in Texas. The temp has been in the 70s in the morning. When I engage EV at start up it shows battery not charged enough and I know the battery was full when I parked it the night before. I think the engine has to be warm for EV to work.
 

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I have noticed the same thing and I am in Texas. The temp has been in the 70s in the morning. When I engage EV at start up it shows battery not charged enough and I know the battery was full when I parked it the night before. I think the engine has to be warm for EV to work.
Battery not charged enough could be due to use of "EV mode" at the end of the previous trip.
Do not think it is related to battery temp.

Giora.
 

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Are you in EU or US? Would there be a difference in models, seems like us North Americans (who have replied) aren't able to do the same.
 

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Are you in EU or US? Would there be a difference in models, seems like us North Americans (who have replied) aren't able to do the same.
Battery not charged enough could be due to use of "EV mode" at the end of the previous trip.
Do not think it is related to battery temp.

Giora.
giora is correct. when the battery has a good charge, it works. when it is 'low' ev mode right upon startup will not engage and state that the battery level is too low.
 
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