I'm only on my second tank, about 350 miles total so far, but I've already determined (at least for me) that NYC driving absolutely KILLS my mileage. Unfortunately most of my miles are in the thick of the city, where it's not stop-and-go, it's stop, stop, stop, inch, stop, stop, etc. But I've seen flashes of greatness while eyeballing the gas gauge when I do take it onto the highway and have extrapolated the MPG: I would be getting much more in the country. first tank (90% city, 10% hwy) I got 25.1, I'm expecting about the same this time around. But what the hell, it's still better than my old 16 MPG behemoth, and it makes up for mileage and more on its form factor alone. My fit has already saved me countelss hours circling around looking for parking - i can now get into all those ridiculously little spots I used to just cruise right by before. In Manhattan, that right there makes it worth its weight in gold!

 

kps, good idea! Here it is.
Intake temperature:100-128 degrees F.
A/C ON / A/C OFF in liters per hour
in DRIVE: 1.4/1.0-1.1
in NEUTRAL: 0.8-1.2***/0.8
in PARK: 0.8-1.2***/0.8
*** fan kicked in
I observed throttle position percentage as well.
For every 0.2 l/h throttle position increases for 1%.
At 0.8l/h it is at 13%, at 1.0l/h is 14%, at 1.2l/h is 15%,......
Since drive engages motion figures are way up in it.
Neutral and Park are identical.
Temperature shift did not make any difference at least at 100F+
All l/h figures were about 0.5+ l/h higher when engine was "cold".

 

Thanks. The figures I see for the MT are the same -- 1.2L/h with the A/C going, 0.8L/h without, in similar weather.

So, people with ATs can save a bit of gas by putting it in park at stop lights -- pretty obvious, but now we know how much.

Taking an example roughly based on someone's figures I recall from another thread, suppose someone gets 24mpg -- 240 miles on a 10 gallon fill. Their commute is 10 miles and it takes them 40 minutes, with half the time stopped. So (240 miles / (10 miles / 40 minutes)) = 16 hours driving time, so 8 hours stopped. Saving 0.3L/h saves about 2/3 gallon in 8 hours, raising the tank mileage from 24mpg to (240 miles / 9 1/3 gallon) = 25.7 mpg. Not huge, but better than a kick in the nuts.

 

(sport a/t) Just drove 493 miles from Modesto to Las Vegas. I filled the tank all the way up before leaving. It does take forever to get that last 2.9 gallons into the tank.

The needle didn't drop under the full mark until 199 miles. Hit half tank at 378 miles! At 493, about ~1/4 tank left. 45-46 mpg? Bet it could touch 600 miles. With a/c of course, freakin' hot here. Gotta go eat and spend money now!

Yeah, I always go neutral at stop lights.

 

Did another round trip to Raton. Same pump, same fill routine.

70 MPH no air both ways, 100 pound load besides myself, no real wind to speak of.

337.5 mi/8.4 gallons = 40.17 MPG

 

My first two tanks gave me a ho-hum 25-26 mpg, about 90% in horrible, bumper-to-bumper city traffic. The tank I'm on now has been nothing but highway miles, and I've already gone 160 miles on less than half a tank. Proof of the obvious: traffic, at least here in NYC, is a real mpg killer.

Anyone local getting similar results?

 

428 km on 28 litres = 35.9 miles / US gallon (if I did the math right)

AT Sport - mostly just my 120lb butt in the car. Up and down the escarpment daily (we call it "the mountain" but you would laugh at it if you saw it!)
Mostly stop and go city driving in 40+ Celcius hot days! Yup, we have them in Canada!
Glad I finally did a calculation as I have been reading others and seemed to go through gas quickly. Guess it is because I am also use to a larger tank on my old van. Still it saves me about 50% of my monthly gas costs.

 

And in true contrast, I got just less than 20mpg inside Las Vegas. A/C sucks the life out of the car in city traffic. There's not enough low-end torque to do the job efficiently.

edit: Just dug the receipts out of the luggage while cleaning up from the weekend trip:
536.2/11.654 -> 46.01 (wow just squeaked in!!)
62.9/3.137 -> 20.05 (ouch!)

Okay, the really low number, that's because I was spooling the motor up around town to get the A/C compressor spinning, because it was so damn hot there.

 

Thanks for providing the information. Perhaps a sticky? Or a FAQ.

Anybody complaining about poor MPG needs to remember that:

With the AC on you are using ~40% more fuel per hour! <edit> forget this line of reasoning folks. sorry. </edit>


Combined with the revised 2008 EPA mileage figure will at least help lower the bar for those of us trying to reach these figures.
https://www.fitfreak.net/forums/eco-...tml#post149292

Thanks again to everybody for sharing their info and experiences.

 

That cannot be possible when cruising... I got 40+ recently with the A/C on. I don't think I'd get ~70 by popping the A/C off! Did this take air resistance into account?

 

When idling. Otherwise, most of the energy goes toward, y'know, moving the car.

 

The really valuable info in this data is that the A/C compressor uses .4 liters per hour, you can see that is is the same in park, neutral or drive. That number should stay pretty consistant whether moving or not, but this could be verified by checking on a straight and level road on cruise control @ 65 mph, click the A/C on and off, noting the fuel consumption variance.

But the math would be (and these numbers are made up): If cruising at 65mph and 40mpg = about 6.0 L/hr, A/C = .4 L/hr; then A/C increases fuel consumption by about 6 or 7% at cruising speeds.

Although these numbers are estimated and should be confirmed by someone with a Scangauge, the resulting figure sounds fairly reasonable to me.

Eric

 

You are absolutely right. I did a bad job writing and reasoning.

Sitting at stop lights with trans in 'D' with the AC on. That 40% at idle probably isn't going to be noticeable. It just 'seemed' like it would at the time. Our weekend shopping trips has us sitting in traffic lights quite a bit with the AC blowing and 4 adults in the car.

I digress.

ewdysar correctly cited the .4 l/hr increase rather than my 40% @ idle.

Yup. I should have noted that. ewdysar wrote what I should have below.

I am interested to see the 'at speed' as well as 'with load' results from ScangaugeII.



Thank you Eric for correctly citing the relevant information.

I made a mess of it.

In the end it doesn't look like AC is going to be much of a culprit for bad MPG.

Has anybody with a ScanGaugeII tested the l/hr with 1, 2, or 3 passengers and/or with ranges from an additional 130 to 400 pounds.

I thought I went through most of the scangauge posts, but I might have missed it.

ScangaugeII come to papa! (I really wish it had a flash USB data logger....pencil and paper with clipboard it is...)

 

new 5AT Fit and I got 36.4 mpg. 80+% highway with A/C on and very rarely revved above 3K. Used cruise a lot too.

I am happy...

 

Just picked up my AT Fit Sport on Sat, July 14th. I went 278 miles with 9.2 gallons of fuel on the first tank - so just over 30 mpg. 70% highway / 30% city - used A/C 50% of the time and drove in sport mode numerous times... love those paddle shifters!

I'm happy with the initial results.

 

Bought my Fit as a certified car with 14k miles on it. Trip from Houston to Dallas yielded 37.2 mpg, all highway, 75 mph average, a/c on. Got 33 mpg on return trip b/c I added 40 short city miles after the trip. A/C is almost always on here in Tx.

 

Laughlin, NV to Southern Cal............ in 100+ degrees heat!

234 miles / 9.26 gallons = 25.3 mpg

85-90(occasionally 100) mph avg. with A/C on #2 and two people in the car

 

85-90 = 100% vtec that is what killed your mpg. Going 75-80 would have really help out your mpg.


Im at 8k now and I have had my first oil change. My first 7k miles had an average of 29.99 mpg with a high of 34 and a low of 27. After the oil change Im hitting 32-33 very easy. My guess is I will see an average of 33 mpg between now and the next oil change. I am a sport Auto.

 

ScanGauge request!! (for A/T)

(1) Get up to 45 mph and shift into neutral, what's the mpg.

(1) Get up to 45 mph and lift foot from pedal, what's the mpg.

 

How, practically, does one "...keep out of high-lift, high-duration VTEC region..."?