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Chrysler 300/300C: MPG-Real World Numbers

52 messages,  Last post on Feb 27, 2013 at 4:40 PM

You are in the Chrysler 300/300C/300C SRT-8 Forum.

What is this discussion about? Chrysler 300, Chrysler 300C SRT-8, Fuel Efficiency (MPG), Sedan

Messages Page 6 of 6

#43 of 52 Re: 25.3MPG in 300 Touring. [daphod74] by xtec

Sep 05, 2007 (3:19 pm)

Replying to: daphod74 (Sep 05, 2007 11:05 am)
I agree with everything you said until you mention to install a K&N filter.I wasted money buying a K&N filter for my '06 Charger SXT.I lost two miles per gallon,plus 5 MPH on speed.After I checked out the stock filter,it says that is a high flow filter.My opinion is to use the stock filter,my results was proof for me.Plus there have been disscussions on forums about K&N,and it a toss up.I think it depends on the stock filter.If you have a thick filter,then i think it may help.The Chrysler filter is thin like the K&N.

#44 of 52 5.7 HEMI by smithed

Sep 25, 2007 (6:43 am)

City: about 15
Highway: about 24 (a lot of 80 MPH driving)

#45 of 52 MPG---UPDATE by greyfox1

Feb 10, 2008 (2:38 pm)

My previous post in this portion of the forum was Reply #25 dated December 31, 2005. My 300C just recently turned 40,000 miles. I tallied up actual fuel used and actual miles traveled out of my "little black book" and found that the average MPG for 40,000 miles was 19.1 . I don't think that is all that bad considering the fact I see folks every day driving mini-vans and SUV's that are not getting that kind of MPG.

#46 of 52 Re: MPG---UPDATE [greyfox1] by coolrunning

Apr 04, 2008 (3:57 pm)

Replying to: greyfox1 (Feb 10, 2008 2:38 pm)
You are so correct. There are a lot of so-called "econoboxes" made by Japanese manufacturers that get the same mileage. 25 mpg HYW from a Toyota Rav4 is not near as impressive as a 5.7L HEMI doing the same thing!

#47 of 52 Re: 25.3MPG in 300 Touring. [xtec] by coolrunning

Jun 23, 2008 (12:43 pm)

Replying to: xtec (Sep 05, 2007 3:19 pm)
I also installed a K & N air filter on my 5.7 HEMI, and have not noticed any improvement in mileage or performance. If anything, I think the mileage is a bit worse, but I attributed that to the weight of my right foot... I had a discussion recently with someone about the high flow air filters and learned something. These filters really make a difference on carbureted engines where you can get more horses from more air/fuel. On modern engines with computer controlled injection and the combustion air intake controlled with mass airflow sensors and oxygen sensors in the exhaust side, you could take the air cleaner off completely and never change the amount of air allowed into the engine. So, what is the point? If anything, the filters don't clean as well and can allow dirt to flow into the micro-sized orifices that meter air/fuel into the cylinders, etc. I am definitely considering going back to stock filters!

#48 of 52 Re: 25.3MPG in 300 Touring. [coolrunning] by shipo

Jun 23, 2008 (3:09 pm)

Replying to: coolrunning (Jun 23, 2008 12:43 pm)
"I am definitely considering going back to stock filters!"
 
I'm thinking that that's a good move.

#49 of 52 Re: 25.3MPG in 300 Touring. [coolrunning] by brit5

Jul 24, 2008 (6:44 am)

Replying to: coolrunning (Jun 23, 2008 12:43 pm)
Fuel injection engines do not work the same way that carbureted engines do.
 
With an intelligent fuel injection system, the increased airflow from reduced air filter obstruction results in the metered introduction of additional fuel to compensate for greater air mass-flow. The engine will make more peak power but will burn more fuel doing so.
 
Maintenance warnings about dirty air filters negatively affecting performance on EFI engines are quite correct, but the performance parameter that is most affected is power output, not economy. A really dirty airfilter not only significantly reduces power, it can also result in air bypassing the filter altogether, carrying grit into the engine with obvious implications for engine life.

#50 of 52 Re: 25.3MPG in 300 Touring. [brit5] by coolrunning

Oct 10, 2008 (1:16 am)

Replying to: brit5 (Jul 24, 2008 6:44 am)
You are absolutely correct. If I owned a 1960's muscle car, I wouldn't hesitate to use a K & N air filter. They are a well designed and constructed product. They are such a risk to modern engines, they are even banned from use by Dodge on any DIESEL engines according to the dealerships. They claim the stock OEM filters do a better job of keeping the dirt out of critical areas. Since I can see daylight when I hold my K & N filter up to the sun, I am inclined to agree. Besides, the whole point was to improve my fuel economy which it did not.

#51 of 52 Re: 25.3MPG in 300 Touring. [xtec] by mopars_outlaww

Nov 26, 2012 (12:07 am)

Replying to: xtec (Sep 05, 2007 3:19 pm)
The only way that K&N air filter would make you loose MPG is if you OVER oiled it or didnt oil it enough. and its IMPOSSIBLE for the filter to make you loose 5mph

#52 of 52 mileage for 2011 limited by brentb

Feb 27, 2013 (4:40 pm)

Just bought a 2011 300 limited with the V-6. I got 28 mpg on the 300 mile trip home. by the time the tank was empty the average was 24 mpg on the trip computer, and 23.8 by hand calculation. I love the car...so quiet and smooth.

Messages Page 6 of 6

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