Mileage reports: Manual transmission (5MT)

[pcs0snq]

On my Fit and how I drive. Steady 55mph cruse (psl 70) is 10mpg less than P&G with eng off glide from 55 to 45 and to 40 maybe 20% of the time. That's BIG.

It's almost impossible for me to slow to 40 on I-95.

[pb and h]

That is big and understandable. I just haven't been able to keep a constant pace of things and as you know I don't have a SGII to definitely establish a difference on how the glide time effects FE. I think you should see if 10 -15mph glide time makes a big difference in FE.

[robodude]

First tank: 35.2 mpg
Second tank: 37.5 mpg
(both manually calculated)

75% highway, 25% hilly roads

Speed on highway: 65-75 mph
Speed on roads: 0-50 mph

Driving style: Little or no A/C, normal driving using real-time mpg as somewhat of a reminder to ease off the gas and coast to stops. Other than that no other mpg saving techniques are being used... yet.

09 Sport manual

[pcs0snq]

Originally Posted by robodude

Speed on highway: 65-75 mph
09 Sport manual

OMG slow down if you want decent FE
Leave early get home later.
Stay in the far right lane and slow down and save fuel

try a tank with 60mph max.
If you do, you'll do 55 next than P&G.

[MKL]

Originally Posted by BlackUp

My first 5 tanks:

Date---Miles_driven--Gallons---MPG(gauge)---MPG(actual)----MPG_error
10/5------300.0------7.84-------??.?----------38.3------------?.?
10/8------274.1------6.95-------46.5----------39.4-----------7.1(18%)
10/11-----350.0------9.40-------41.3----------37.2-----------4.1(11%)
10/15-----303.0------7.54-------45.4----------40.2-----------5.2(13%)
10/18-----314.0------8.38-------43.5----------37.5-----------6.0(16%)

between the mpg gauge and actual hand calculations at the pump I have seen and average of a 5.6 mpg (14.5%) optimism.

These tanks have a few common conditions:
- ~90% 55mph roads, 10% city
-tires: 33psi
-load: 300-400lb (passenger + gear)
-weekday trips of ~100mi+ round trips at 50-55 average mph
-no FAS (except for 3-4 times totaling 1-2mi on the 10/15 tank)
-very little P&G (none on most tanks)
-a few instances of "hard driving," especially in the 10/11 and 10/18 tanks, which included rushing to work (65mph+, fast starts, higher rpm shifts) and even some 5500 rpm shifts to see what the car can do

my top two 50mile drives resulted in 58.3 and 56.9 mpg gauge readings
so if i use the largest error of 18% to estimate those mpgs, I would have 47.8 and 46.7 mpg tanks

Are you using a scangauge, if so go to menu -> Fillup
Make sure you are telling the scangauge how many gallons(liters?) you actually filled. It will do average over a lot of tanks. Starting with your 5th fillup or so it will be much more accurate.

[BlackUp]

Originally Posted by MKL

Are you using a scangauge, if so go to menu -> Fillup
Make sure you are telling the scangauge how many gallons(liters?) you actually filled. It will do average over a lot of tanks. Starting with your 5th fillup or so it will be much more accurate.

that data was from the in-dash Honda mpg gauge. i just installed my sgII and will be posting that data in the near future. you cant adjust the Honda gauge.

[robodude]

Originally Posted by pcs0snq

OMG slow down if you want decent FE
Leave early get home later.
Stay in the far right lane and slow down and save fuel

try a tank with 60mph max.
If you do, you'll do 55 next than P&G.

I keep trying to slow down but my foot is heavy... either that or my gas pedal is very light.

Besides I'll likely get ran over around here going 60mph on the highway. I often get passed when going 75 mph.

[pb and h]

can't never could

[pcs0snq]

Starting this tank from a 1st click fill and using a 55 to 40 P&G on I-95, I saw 115 mile till the F mark today. Looking at my log book, that's the best I have done.

SG is only saying mid 55 for FE but with a 12 correction in there's no telling.

[BlackUp]

my most recent tank:

336.1 miles driven
7.605 gallons filled
49.5 on the Honda gauge
47.2 on the SGII (with a positive 1% speed adjustment)
44.2 calculated by hand

most of my technique was to just go easy on the throttle while cruising 40-60mph. slower up hills
i also: coasted in neutral, small amount of p&g, psi @ 44, 80% hilly roads @ 50mph average, 20% city with some heavy traffic
did 4 miles on washboard gravel roads too
400 lb load

[trancedsailor]

Last time I checked (not as hardcore as you guys) I calculated 32mpg it was like 283mi / around 9 gallons

[x98myers7]

you guys are insane doing PNG and shit on the hwy

i set the cruise at 75mph and get 35mpg. if i have a bunch of time on my hands i cruise at 70mph and get 38mpg. i'm still on the original oil, too at ~6300miles (just hit 20% remaining).

i can't wait to see what happens to mileage once i get all the break-in fluids out of the oil.

Originally Posted by BlackUp

49.5 on the Honda gauge
47.2 on the SGII (with a positive 1% speed adjustment)
44.2 calculated by hand

this is pretty crazy. i can't believe the OE gauge is that misleading. as long as it is consistent, then that is what really matters.

[trancedsailor]

wow you sure you just hit 20%? That's insane. I'm at 4600mi and I hit 20% around 4500. I'm going to wait til 5000mi to get my first oil change. I'm thinking something 0W-20 or at the very least, full synthetic 5W-20

[x98myers7]

yeah, but like i said... i drive almost all highway

i'm going to use genuine honda oil for this change. i'm not sure if i'll convert to synthetic later or not.

[trancedsailor]

Oh yeah I am like 90% city driving lol yeah I guess for my first oil change I'll go with what Honda recommends, then after that I'll do it myself with synthetic.

[BlackUp]

Originally Posted by x98myers7

this is pretty crazy. i can't believe the OE gauge is that misleading. as long as it is consistent, then that is what really matters.

That was actually only 11% error. I have seen up to 16% error.

BTW im at 2000mi and still at 90% oil life.

[pb and h]

In for another tank:

100miles of Cruise control at 55mph(for a conference). The rest of the tank was P&G like the last one.

546.6miles
9.5gallons used
= 57.5mpg

I was thinking today and doing some calculations and I believe I will stop trying to get more than 50mpg. If gas prices stay where they are that is; I will only be wasting about $300 a year vs $900 and of course time is the other issue that I will not be wasting.

[spinlooproll]

Originally Posted by BlackUp

my most recent tank:

336.1 miles driven
7.605 gallons filled
49.5 on the Honda gauge
47.2 on the SGII (with a positive 1% speed adjustment)
44.2 calculated by hand

most of my technique was to just go easy on the throttle while cruising 40-60mph. slower up hills
i also: coasted in neutral, small amount of p&g, psi @ 44, 80% hilly roads @ 50mph average, 20% city with some heavy traffic
did 4 miles on washboard gravel roads too
400 lb load

question: why coast in neutral? Didn't engines cut fuel if you coast in gear? Or is it because coasting in neutral gives you more miles than it costs you gallons while allowing coasting for longer?

[BlackUp]

Originally Posted by spinlooproll

question: why coast in neutral? Didn't engines cut fuel if you coast in gear? Or is it because coasting in neutral gives you more miles than it costs you gallons while allowing coasting for longer?

if you are in neutral, you wont be turning the tranny and engine with your car's inertia (although much less so with a AT vs a MT)
ever let go of the gas in a manual while in gear?
in essence, you will be able to coast much longer, esp in a MT

[spinlooproll]

Originally Posted by BlackUp

if you are in neutral, you wont be turning the tranny and engine with your car's inertia
ever let go of the gas in a manual while in gear?
in essence, you will be able to coast much longer, esp in a MT

Sorry I'm only talking about MTs, don't drive autos much.

agreed, but i guess it comes down to how and where you want to coast. If I have to coast down to almost no speed, like off a freeway onto a ramp and then a light, coasting in gear will probably work better because until a low enough rpm (which you can avoid by shifting down at appropriate times) you'd be using 0 fuel.
If you want to just coast for long distances, using the idle gph is an acceptable cost because of the longer distance you can coast in neutral.

I hope I'm making sense.