Chrysler 300/300C: MPG-Real World Numbers

50 messages, Last post on Oct 10, 2008 at 12:16 AM

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

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#49 of 50 Re: 25.3MPG in 300 Touring. [coolrunning] by brit5 Jul 24, 2008 (5:44 am)
Replying to: coolrunning (Jun 23, 2008 11:43 am) 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. Replies to this message: coolrunning (Oct 10, 2008 12:16 am)
#50 of 50 Re: 25.3MPG in 300 Touring. [brit5] by coolrunning Oct 10, 2008 (12:16 am)
Replying to: brit5 (Jul 24, 2008 5:44 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.

#49 of 50: Re: 25.3MPG in 300 Touring. [coolrunning] by brit5; Jul 24, 2008 (5:44 am)

Replying to: coolrunning (Jun 23, 2008 11:43 am)

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.

coolrunning (Oct 10, 2008 12:16 am)

#50 of 50: Re: 25.3MPG in 300 Touring. [brit5] by coolrunning; Oct 10, 2008 (12:16 am)

Replying to: brit5 (Jul 24, 2008 5:44 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.