We purchased an '11 Fit base 5AT new a couple years ago for my wife. Overall its a great versatile car and we love it, but the mileage has always been lowerthan expected. The highest average (not running the A/C) has been about 25mpg, and this is mostly around town, 23-24mpg is typical. I've driven it, my wife has driven it and it always does about the same. We've also changed tires, etc with no change over about 16k miles.

We had the car in to have the A/C checked (there is probably nothing wrong but the A/C in the Fit is not made for Texas) and they gave us a loaner '13 Fit. Doing the same drive with the A/C blasting I'm averaging 29mpg and the engine is not working as hard...my wife pointed it out and she is usually clueless. I think we got a bad one. :/

 

Just drove my 12 Fit Sport to Terrell Texas and back approximately 3k miles average probably around 28mpg. Did not help with roof rack, full load, A/C running around 18 hours straight and doing around 70 up to 90 mph. Was hoping for high 30s.

 

How are you calculating mpg?

 

Me or JRTritsch?

 

there are so many variables that affect mpg's.I'm averaging 30.1 in just about all city driving with my 2012 sport A/T

I have been impressed since break in and I run 87 octane here in Socal.I rarely use AC because the temps are not that high in my area.I honestly drive about 98% city stop and go traffic so 30mpg is really good.

The funny thing is I romp on my little Fit all the time and do canyon runs weekly and never drop below 25-26 this is with hand calcs but the cars display is not far off.

 

JR, how many miles do you have on your fit?

 

Im in Fort Hood, just 40 minutes away.

My manual averages 40mpg, sometimes higher, going 60mph

My buddy's wife's 2013 automatic Fit gets on average 2-5mpg better then me on highway due to the longer gearing.


I suggest modding your car a bit.

1) better battery ground cable. the stock one SUCKS and is tiny
2) upgrade the alternator wire. I ADDED a zero gauge power wire going from alternator to the bolt terminal at the battery. Honda gave use a nice big threaded stud on the terminal to bolt on stereo power and alternator wires!
3) look at the sidewall of your tire and increase the pressure. My factory tires are 40psi max, so thats what I run.

Keep in mind, new tires dont always WEIGH the same. its VERY common for a 15 or 16inch rim to use a 18-24 pound tire depending on style/tread/purpose

I found a set of 195/60 tires to go on my 15in steelies that add 1 pound (stock dunlop 15s are 17). If I hadnt been looking at weight, I almost would have pulled out the cash for some very nice all seasons I found, but they weighed nearly 24 pounds each!


adding 2-3 pounds per tire will hurt mpg noticeably

 

yup yup yup...

 

Is there a DIY somewhere for this? I'm liking the idea but would like photos and further details.

Thanks!

 

here's mine

 

OP. kjlljljljlkjklkn,mn

 

Thanks for the pics. Do you know the brand and model numbers for the cables?

Thanks!

 

0/1 AWG from crutchfield

 

What would changing the cables do for mileage? There is no correlation there at all since other Fits with the original cables can get better mileage than his?

 

I never knew about the weak grounding cable, not sure how much it'll affect my MPG in our '10 Sport AT but it's not like 0 GA cable is expensive.

 

I don't think you'd see any measurable difference in milage. There may be other benefits, particularly if you have some high current draw accessories (like a big subwoofer amplifier), but if you're attempting to improve milage there are far more effective methods—such as slowing down a little.

 

Everytime something draws quite a few amps, like the radiator fan, or the initial turnon of the blower, the voltage drops a bit, and everything slows down a second.


Over hte course of a long roadtrip, the effects can add up if you were able to directly compare it to a modified Fit.

In my case, the alternator wire and improved ground wire had the great effect of reducing and even removing the flickering in some situations.


The better grounds is good overall for the car. All your sensors now have a good path to "flow" power that is needed.


I currently have a different battery (one of those small audio abtteris) but I will be switching to a 51R, the style of the civics. Its a cheaper battery then the 151s we have, and they tend to be a bit more powerful for the money ($130 151 is garbage to a $130 51r, but a $60 lower brand 51r still performs great)



By far the biggest method of inreasing gasmileage is maintaining tire pressure (weekly checks) and learning to NOT stomp the pedal. its hard to feel the pedal on a drive by wire setup. Honda should never have gotten rid of the cable throttles!!

 

Bigger wire will make NO noticeable difference. See this post #10 where I did the math for you.

https://www.fitfreak.net/forums/1st-...ower-wire.html

 

Lol kind of sounds like me. As was already mentioned try to go easy on the throttle and keep those tires a little on the hard side. I do 38 psi all around. Another thing I try to do is coast into stops, try to use momentum to coast, and try not to use the brake as long as you can as this is a waste of momentum.

 

Talking about MPG... every car is diff: different driver ... different gas... diff driving habits.... diff road condition... diff traffic...