I would stay clear of K&N, more flow = less filtration. with K&N a UOA will reveal elevated Silicon count, will wear out your cylinder walls. oil from filter will foul sensors.
See link for pressure drop between clean and dirty filter, best results from modifying the intake tubing rather than messing with the filter.

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MPG: I found that some gas stations give less mpg compared to others, usually anything with ethanol will yield less mpg.

 

i agree with this guy about the K&n comment.

from my experience i think keeping a high tire pressure has been the best for mpg improvement. like i would more then double my gas mileages by just keeping my tires well inflated

 

Shell gets me 20 miles more per tank

 

I drive slow(between 50-60mph), slow acceleration, and slow deceleration.

 

don't change up your driving style, it doesn't seem like ur ricing around or anything. how many miles on your 08? Changing up your spark plugs could be a good start to getting better MPG.

 

Unless you are driving on very smooth surfaces a highly inflated tire creates more rolling resistance..... The radial plied sidewalls are supposed to flex to improve fuel mileage and prevent the belted tread from rolling under or lifting off of the road surface in turns, over inflation prevents this from happening and so the radials work no differently than bias ply tires

 

Do a google on it. This is what all fuel companies should be doing for the customer's and the environment. Shell is a partner in this. Most difficult to find any where in the North East. Big boy distribution networks - not in our interests.

It is for real. I gained 10% avg MPG in a 12yr old Cadillac. We need to ask, "Why not.".

K_C_

 

I've noticed that when I'm driving interstate that when I go the speed limit "75" my car tends to shift from 5th to 4th on every little incline in the road which I'm sure limits my gas mileage.....any way to prevent this or is there a different speed I could go that would get better mileage?

 

More likely it's disengaging the torque converter than making full gear changes. The only thing you can try is to shift into Sport mode and manually try to get to 5th. You'll still notice the torque converter disengaging periodically, though.

 

There was a recent post by a guy that said his automatic transmission was doing the same but there was enough of an increase in torque from changing over to premium fuel that it was no longer down shifting on hills.

 

No T_C why did you say that...the 244 guy will now be posting in this thread to keep repeating the same crap in every thread that mentions the word premium even if not talking about fuels. :P

 

I drove like I always do (actually a bit more aggressively due to wanting to feel out the car) and I got 37 mpg on my first tank....how do you guys get less?

 

I had forgotten all about him since I used the ignore function.. There is a major difference in telling a person how to address a problem with a solution and being a problem that ignoring is the only way to deal with.

 

If you drive aggressively and want better fuel mileage, more octane.... I only got a couple more MPG than what you are getting but I was driving miles at a time at 90MPH and passing long lines of slow movers on 2 lane highways.. That was before the KWSC...

 

My experience reflects that of the other comments on this thread. The two biggest gains to gas mileage I have see have been with driver modifications and tire inflation. My wife's average mpg with my fit is 35mpg and my average with regular driving habits is 40mpg. While hypermiling, I managed to get up to 54mpg.

I typically air my tires up to 4psi under max. I can tell when they start getting low because my mpg goes down. I have seen a lot of people saying that your tires wont last being aired up like that. The tire wear I have seen seems to be acceptable to me. At 120k total car miles (69k on the tires) I am down to 6/32" on my first replacement tires after replacing the OEM Dunlops at 51k.

'07 Base MT

 

I do nothing to improve my FE. My average MPG to date is just a tad over 29mpg, which I'm ecstatic about being that the Tokyo area is not the most fun place to drive around everyday and my right foot only knows 555(go go go). Even the expressways are like parking lots often times and you pay for express service!

I keep my tires at about 220~230kPa(31.9~33.4psi). More than enough pressure being that the sidewalls on AD08's are super stiff.

 

the ten gallon tank shows in city traffic but i still get pretty decent mileage if i just keep from flooring it from light to light

 

my strategy for the search for ultimate MPG's:
1. Enter on freeway
2. Get behind semi truck
3. Draft behind him and keep a steady foot on the gas pedal (use clutch when ever possible)
4. Watch MPG's go through the roof.

 

Well. One of the best things to do for better mpg is to reduce weight. Although the Fit is indeed a VERY light car, it can be lighter. For instance, that bench seat in the back of the GD3's weighs at least 75 lbs. For me, I never had more than three people in the car at any given time, and the added cargo space is very welcomed, plus I noticed about a 3 mpg difference. So, if you don't have a ton of people in your car often, you can take that bench seat out and save on some weight.

 

I put a mast and sail on my Fit. Also, I hired an illegal immigrant to provide pedal power to the back wheels.