I'm not sure. Have you:

1. pulled all OBD pending and active codes using an OBD reader
2. changed to sticky summer only tires (you'll lose 10% or 4 mpg by using non-ECO tires)
   1. added larger diameter or wider tires
3. added significant weight and/or changed the aerodynamics to the car
   1. added a bike rack to the top
4. other changes

 

Also have an 18 Sport w/CVT. Focusing on smileage instead of mileage in combined city/highway driving I manage 37mpg on a bad day. Normally I run 41-44 mpg when driving more conservative and have maxed out at 51-51 mpg on a tank of gas.

EDIT: I never use ECON Mode and mostly use the D position on the CVT although sometimes its fun to paddle shift!

 

So have you run any diagnostics on your car to determine why you’re getting sub 37 mpg?

 

What speeds are you running? The faster the speed, the more gas is burned to maintain it. 35-37 is around what is advertised for an EX CVT:city/highway/combined 31 / 36 / 33

 

Even on Interstates at 65 - 70, I get over 40 mpg. Every weekend I drive about 30 miles each way. I take back roads going (50 mpg average) and the Interstate coming home (43 mpg).

 

were you in neutral when you achieved this ?

 

Anyone notice a difference in mileage after dumping in a good amount of Techron concentrate fuel cleaner?
Lemme show you my results:



Coincidence? Maybe. But it doesn't feel like it though. What do you guys think?

Edit: Each successive picture is a continuation of the previous. It's gone back down a bit now though with the cold weather here and the tires are set to recommended pressure.

 

It's good to use Techron occasionally, but I don't know if they claim it will give you better mileage. Here are my latest mileage figures: 42.5, 40.5, 43.1, 45.2, 42.1, 45.3, for an average of 43.1, which is about what I've averaged for 59,000 miles. My driving is more or less the same, but you can see the variations.

 

I dump in a bottle every oil change

My fuelly.com history (100+ fill ups, 1+ yr, over 33k miles driven) does not show any negative nor positive impact

(that said, I'm still gonna keep dumping 1 bottle per oil change, regardless)




example, fill up #84 shows a "techron" entry:
http://www.fuelly.com/car/honda/fit/...rgerfan/787323

 

It's supposed to be good for the fuel system, and I've heard lots of recommendations and no complaints.

 

100% agreed

this is why I'll continue to use it, even if it makes 0 impact on my mpg's

 

As soon as the weather got cooler, I noticed that it took longer for the blue light to go out and the engine to warm up - and gas mileage is slightly lower.

 

Over my last 12 fillups on my new 2019 Honda Fit LX, I haven't seen anything out of the ordinary:
* Fit LX with no options: 41.6 mpg + 3.5 (1sd) mpg at ~ 5000 miles on the same first oil Factory fill
* I drive with ECO on and relatively conservatively
* n=12 fillups of almost all 87 octane - some TopTier
) I always add 1.3 gal of additional gas when the pumps kicks out to even out top off error
* have mostly highways miles but track usage for my job
* results:
< no statistical difference using TopTier gas for mpg
< no additional break-in mpg improvement from 0 to 5000 miles
< while actual mpg tracks with indicated trip mpg; indicated is +4-6% higher than actual receipt mpg math
< mpg is driven by mostly the % city driving and outdoor temperature (thermal efficiency)
< YMMV

See attached

 

I, too, drive conservatively to get good mileage, but my mileage does vary, depending on conditions. Lots of traffic, red lights, and stop signs hurt mileage, as does driving at 70 MPH on Interstates. My last three tankfuls got me 40, 42, and 58. The 58 was for just 1.9g. I filled it because I have a trip coming up. You can see my average for 59,200 miles below.

 

The one item I do is to add an additional 1.3 gal of gas when the pump kicks out at full to minimize top off error in calculating the actual mpg. It is different for different cars - my old CRV was 2.1 gal (tall single tank), my RX-8 is 0.4 gal (short saddle tank).

 

I always wait a couple of seconds after it clicks off and then let it click off again. It takes very little gas at that point, though. I always figure the mileage mathematically, not by the dashboard.

 

hey guys, just wanted to share my last 49 fill ups. biggest takeaway for me is going from Low Rolling Resistance tires has dropped my 10 newest fill ups from 40 down to 37.9 mpg. take it for what its worth:




BEFORE:


AFTER:





Some More Charts To Share:

BEFORE:




AFTER:







NOTE:
-driving style stayed the same
-tire sizes stayed the same (but of course, brand to brand varies compared to another as far as weight and diameter goes)
-same psi in tires
-same engine mods
-same maint schedule/habits

 

What tires did you go from and to what tires did you go to?

 

old tire:
Hankook Ventus V2 concept 2 All-Season Radial Tire - 195/50R15 H





new tire:
Achilles ATR Sport Radial Tire-195/50R15 82V

 

I get occasional highs and lows, probably because of the point at which the pump shuts off. I always go for one more click after that. As soon as the weather got colder, mileage dropped to around 40.