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May 14, 2013 9:00AM
Most of this list is great, but claiming that a car will loose 40% to 60% of its feul economy when the "check engine" light comes on is just not true. In many cases it will have no effect at all on fuel economy.....and you know it! In fact, many dealers refer to the check engine light as the "moneymaker light". It boosts profits for most automotive service departments while often delivering minimal benefits to the vehicle owner and the environment. 

Please take articles like this with a grain of salt. " an oxygen sensor is usually what triggers a pesky check-engine light." This comment right here is very misleading. Although a bad O2 sensor can trigger a light, O2 sensor don't go bad as often as some folks state. There are many reason an O2 code can be triggered. The O2 sensors have a fixed parameter it operates in, anything that can cause the exhaust to operate outside of those parameters will trigger and O2 light.  Such as , misfire, vacuum leak, low engine temp, bad reading on intake air temp. As you can see the list can be very long.

 What should have been said is a check engine indicates a problem was detected within the engine control system and should be checked out for the cause.

May 14, 2013 10:30AM
Wow. 10 clicks to read the same thing over and over; maintain your car. What a genius. I would have never guessed. This is a cheap way to get readers to click click click. Good job MSN AUTO.
Nov 1, 2013 7:40AM
how about dropping ethanol and  winter mix you  lose 3 to 5 miles per  gal . how  about just making a good  grade of  gas  like they did 15 years ago and quit with the smoke and mirrors  if they made the same grade they did 15 years  ago all cars and trucks would  be getting 5 to 10 miles more  per  gal   
Nov 1, 2013 4:03AM
. . . And the number one on the hit parade of poor fuel economy was never mentioned, LONG IDLE PERIODS. Folks who let the engine idle while going to get a cup at Starbucks or to grab a snack at the local convenience store. That is ZERO MPG. Shut it off!  
May 14, 2013 10:26AM

With all the electronics and technology advancements... It would be nice if they have in-built diagnostics to have the vehicle find out the cause when a 'check engine' light comes on.


If CARMD can do it, why can't the car manufacturers? ;-)

Nov 1, 2013 7:02AM
They left out the biggest component in fuel economy, the driver. A hyper miler can get 40mpg out of any regular sedan, a "racer" will get 10mpg out of a Prius.  Take it easy at the lights, especially when the next one is red. Driving fast doesn't make your d*ck any bigger.
Jul 29, 2013 5:57AM

What the heck!  The people in your picture are not wearing seat belts.  A convertible with 2 kids in the back seat, no seat belts, top down. 


Nov 1, 2013 7:25AM

Leaving my car in the garage seems to be the best way to help my monthly gas tab ! Sort of like keeping yourself from being overweight - - - keep your mouth from being used !

Nov 2, 2013 1:45PM
Keep my engine happy? But my car has never shown human emotion before..
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