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Old 02-17-2014, 09:23 AM   #51
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So in your original post, it seems that you were concerned that one of your recent mods may have caused the decrease in mileage. My recommendation would be to drive through the few tanks as the car is now and if mileage still seems to be a bit lower than before then remove one at a time and re-test. It may take you a few weeks (depending on how much you drive) to get enough data to come to any kind of conclusion but when you do multiple things at once it becomes hard to track what really helped or hurt your mileage.
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Old 02-17-2014, 12:49 PM   #52
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Definately. However the thing im suspecting is more the cold weather, and snow tires than anything else. I cant control the weather, and dont want to lose the stability of the new tires, so Im stuck till spring.
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Old 02-17-2014, 02:23 PM   #53
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Definately. However the thing im suspecting is more the cold weather, and snow tires than anything else. I cant control the weather, and dont want to lose the stability of the new tires, so Im stuck till spring.
My mileage always takes a dump in the winter months...I use winter tires and have my snowboard rack on, those two combined with the super cold air, winter gas and me enjoying playing around on snowy streets ensure a several mpg drop over my summer setup.
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Old 02-17-2014, 02:41 PM   #54
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Definately. However the thing im suspecting is more the cold weather, and snow tires than anything else. I cant control the weather, and dont want to lose the stability of the new tires, so Im stuck till spring.
Yeah I think you will see a nice increase in mpgs when the weather warms up. From everything I have read on ecomodder and cleanmpg.com 75-85 is the optimal temperature for fuel economy. Below 70 degrees people generally see a gradual decrease in mpgs. Then below 40 degrees there is a drastic drop in mpgs. I think this is partially why I see such a great increase in mpgs with my cai as I live here in TX where during the summer the temps are steady above 99 degrees so the engine bay temps are alot hotter than that, so grabbing the air from down below in the bumper is much cooler.

We went to Mount Magazine, Arkansas this weekend which was about a 5 hour drive from us. It was about 310 miles. On the way up there I tried to maintain a semi fuel efficient mindset but I was not going to creep along either. I filled up once along the way just to keep it topped off. I averaged about 43mpg there which really surprised me since we went from about 600ft above sea level to 2500ft above sea level. The temps were about 45-55 degrees on the way there.

Here is something awesome I noticed. In Arkansas apparently ethanol is not required in gasoline. When I filled up at a shell there that had no ethanol I noticed my car was much peppier.

Before we headed back home I stopped and filled up. On the trip back there was some very "spirited" driving and without stating anything against forum rules I'm very glad I had my Passport 9500 I cut almost an entire hour off the trip(=

Here is the kicker. I drove the entire trip back and still have over a quarter tank left. I'm going to fill up today to calculate my mpgs. Also I will upload the fuel receipts and miles for comparison.
The weather was about 69 degrees on the trip back. And I filled up with ethanol free fuel.

So two things, warmer weather and ethanol free fuel if you can get it.
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Old 02-17-2014, 02:58 PM   #55
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Not sure if here in Michigan its required to have methanol in its fuel.
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Old 02-17-2014, 05:16 PM   #56
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My summer mileage in the city is 29-30 mpg, winter is 25-27 mpg depending on the temperature. The super cold temps lately have me near 25 mpg.
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Old 02-17-2014, 05:27 PM   #57
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My summer mileage in the city is 29-30 mpg, winter is 25-27 mpg depending on the temperature. The super cold temps lately have me near 25 mpg.
I bet it has been insanely cold up there this year. We aren't used to all this cold stuff down here haha. Its back to 75 degrees today(=
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Old 02-17-2014, 11:05 PM   #58
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My summer mileage in the city is 29-30 mpg, winter is 25-27 mpg depending on the temperature. The super cold temps lately have me near 25 mpg.
That's about what Im getting right now. It just seemed really weird that as soon as I swapped wheels, the mpg went down. Or at least that's the way it seems.
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Old 02-18-2014, 02:46 PM   #59
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Not to further kill your theory's of "cold air intakes" but doesn't metal heat soak worse than plastic? So your telling my the air down and to the left of your engine is cooler than the air coming from though your hood into your intake directly? We even have a nifty heat blocker around the stock scoop. If your telling me the air down there is cooler. Than you have to take in account the metal tube VS. plastic tubing. Plastic retains less heat causing the ambient air temp inside the tank to stay closer to the air temp it is sucking in. Further more the stock intake is much shorter allowing even less heat soak compared to that (very purty indeed, cool air intakes look GREAT, really do) but very long and super hot metal pipe. So not only is it hotter, its hotter longer. Plus anyone who has had a college level physics class knows that the longer a tube is the less efficient it is. Going even further in depth, have you ever heard the saying "Your team is as strong as your weakest player"? So what's the weakest player on the stock intake, the MAF size, guess what, the cold air intake has to have that same size MAF opening.

I'm not saying this to just be a **, but to certainly educate future members of the forum and let them have a more open and educated mind on wither or not an intake is right for them. I would never say it is a waste unless your asking me if you should get an intake purely for power. For looks, cool noises, and having that feeling of having an intake it could be worth it depending on how you view your money.
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Old 02-18-2014, 02:50 PM   #60
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That's about what Im getting right now. It just seemed really weird that as soon as I swapped wheels, the mpg went down. Or at least that's the way it seems.
It very well could be the wheels. Weight alone of the wheel can make a difference. Could you tell a difference in braking? Usually driving wise you cannot tell much through acceleration, but when you brake you might find yourself stopping slower. I went from a 15" wheel on my Lancer to a 17" wheel and although taking off it wasn't any slower, braking it made a difference. If you can't tell any difference between the two at all in driveability than the difference would be too small to really decrease your mileage noticeably, so at that point I would look else where, possible wheel bearing, dragging brake, fuel filter, spark plugs, miss-fires, and vacuum leaks. Maybe even a MAF cleaning. Winter gas or even just mother nature.
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