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  #11  
Old 07-31-2013, 10:20 PM
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I agree with all those EXCEPT the air filter one.

I don't care what you say, a clean air filter will get better mileage. True, the ECM will adjust for the available air, but you'll lose power in the process, thus requiring more throttle and using more gas.

My wife's 2007 Kia got 37mpg with a stock air filter, and 42mpg with a K&N drop in replacement on the same exact trip. Shoot, even my old '96 Dodge went from 13mpg to 15mpg with the addition of a CAI...
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  #12  
Old 07-31-2013, 10:56 PM
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Quote:
Originally Posted by TRCM View Post
Above 40 mph, it's better to have the ac on, below that, windows down

And the idling thing was true with carbs, but not with FI.
Yes agreed that is what I was saying.
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  #13  
Old 08-01-2013, 05:06 AM
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Quote:
Originally Posted by TRCM View Post
And the idling thing was true with carbs, but not with FI.

BULL! it is true in ALL vehicles, carb, FI, or diesel!
a gas engine HAS to use X amount of fuel to burn Y amount of air (stoichiometric AFR) other wise it burns up from being lean or loads up and dies from being rich. it does not matter if carb or FI.
once the engine is @ operating temp there is no fuel enrichment on start(choke) so starting does not use more fuel. a running engine that is not moving is just wasting gas!
If I use my remote start often I see a 1-2 mpg difference vs starting and dropping it in gear to go!
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  #14  
Old 08-01-2013, 07:21 AM
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Great info. I'm not sure that I agree with some of it, but it's still good info




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  #15  
Old 08-02-2013, 12:40 PM
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trcm, that is why start stop tech is catching on.
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  #16  
Old 08-02-2013, 12:41 PM
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trcm, that is whay start stop tech is catching on.
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  #17  
Old 08-02-2013, 04:04 PM
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Quote:
Originally Posted by scrappy View Post
BULL! it is true in ALL vehicles, carb, FI, or diesel!
a gas engine HAS to use X amount of fuel to burn Y amount of air (stoichiometric AFR) other wise it burns up from being lean or loads up and dies from being rich. it does not matter if carb or FI.
once the engine is @ operating temp there is no fuel enrichment on start(choke) so starting does not use more fuel. a running engine that is not moving is just wasting gas!
If I use my remote start often I see a 1-2 mpg difference vs starting and dropping it in gear to go!

Really....using the info in your own post, if the engine is at temp, it is cheaper to turn a FI enigne off and then back on.

Well, a choke cuts AIR out, not fuel. The choke operation does NOT provide fuel enrichment, it provides air starvation. Yes, their is a certain stoichiometric ratio for ideal AFR, but no real engine runs at that AFR.

The fuel enrichment circuit for acceleration purposes (power valve, accel pump, etc) is actuated whenever you push the gas pedal....and there is no way around it....unless you can start you carb engine without touching the gas pedal at all (I never had one like that in 30 yrs of driving), you will dump excess fuel into the engine during starting, which is why there is a short rev once it fires.


So, you waste gas by starting and stopping a carb engine compared to idling it due to the acclerator pump being directly linked to the accelerator pedal via linkages, but NOT an FI engine, because it's "accelerator pump" function is not directly linked to the pedal, it is accomplished by increased bandwidth at the injector (or a longer fuel shot).

YOU correctly mention the temp compensation, which does affect idle )once the engine warms up, less fuel is burned at idle), but does not affect the pump shot from moving the accelerator pedal with any directly linked fuel delivery system. On my diesel, the linkage was direct, but the amount of fuel dispensed per each degree of change in pedal posoition was also affected by boost, so less boost, less fuel is needed, so less fuel is provided. Again, not directly proportional like a carb throttle linkage is.

The myth claims it is true that idling saves gas over start/stop....on a carb engine, yes, on a FI or diesel engine, no.
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Last edited by TRCM; 08-02-2013 at 04:17 PM.
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  #18  
Old 08-02-2013, 04:21 PM
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As far as idle goes, I'm sure there is a certain time where if you shut the engine down, it will save fuel. The time is probably less than 1 minute, but who is going to mess with that at a red light. The time is different for a carb engine and a fuel injected engine I'm sure, but how much different? You can see even a carb engine is going to save fuel by not letting the thing idle for an hour vs shutting it off and restarting an hour later.

I still say leaving the air off and the windows down is better for fuel mileage. I remember reading this not to long ago on one of the news things on the internet, like MSNBC. It doesn't matter if its in town or on the highway. But it really doesn't matter to me, I do what ever is comfortable.
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  #19  
Old 08-02-2013, 04:30 PM
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Quote:
Originally Posted by dodge man View Post
As far as idle goes, I'm sure there is a certain time where if you shut the engine down, it will save fuel. The time is probably less than 1 minute, but who is going to mess with that at a red light. The time is different for a carb engine and a fuel injected engine I'm sure, but how much different? You can see even a carb engine is going to save fuel by not letting the thing idle for an hour vs shutting it off and restarting an hour later.

I still say leaving the air off and the windows down is better for fuel mileage. I remember reading this not to long ago on one of the news things on the internet, like MSNBC. It doesn't matter if its in town or on the highway. But it really doesn't matter to me, I do what ever is comfortable.

Problem is, it does matter. The drag from the windows being down grows exponentially with speed, but the drag on the engine from the a/c compressor spinning is basically constant at highway speeds. Again, you can do what you want, but it has been proven by mythbusters and others that using the A/C saves gas at highway speeds (actually above 40 mph), especiallyu on todays cars & trucks that are very aerodynamic....but only when the windows are up.

And the newer carbs weren't as bad, but the older quadajets and hollies would dump a ~teaspoon of fuel in at startup, every time you mashed the gas pedal....and that is a lot of fuel to waste. But once they got warmed up, the fuel usage idling wasn't bad.

The biggest thing is FI gives precise fuel metering, a carb is nowhere near as exact at metering fuel (and why they are no longer used for daily drivers).
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  #20  
Old 08-03-2013, 08:41 AM
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Yeah, I stand corrected, either what I've read before was wrong or I just have a bad memory. It appears that somewhere around 50mph is where its better to have the windows up and the air on. It makes more of a difference on a car that is more aerodynamic than say a truck that is less so, but even on a truck, its better to have the windows up at highway speeds.
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