I do not care how much is in the tank.

I fill the car to the top of the neck, record the current mileage, and drive. Then at the end of the trip I fill it up again to the top of the neck, read the pump, and read the ending mileage. Then I subtract the starting mileage from the ending mileage to determine the total distance driven. Finally I divide the mileage by the total gallons used. How big or small the tank or how much was in the tank before the first fill up has no bearing on the calculation. Actually the Honda odometer which I have calibrated to a GPS and Interstate mile markers has a slight error of about .4% which was measured over a distance of 50 miles to reduce calibration errors. The odometer reads slow but the error is insignificant and I do not bother including it. If I did it would only add another .176 mpg.

That is the way I learned to do it in 6th grade and is how I do it on all of my vehicles including my airplane. The only difference in the air is it is tack hours on the airplane rather than miles. I can also do it in miles in the air but I would have to measure the line of site distance on a sectional, enroute chart, or my GPS rather than reading an odometer. Miscalculating or mis-estimating mpg or miles per tack hour can be disastrous when airborne. Two other variables that enter in the calculation is the wind direction, wind speed, and elevation. Believe it or not these same variables to a lesser extent also enter into mpg on land vehicles. In over 5000 hours of flying I have never run out of fuel. Oh yes, I also have never run out of fuel on a land vehicle.

I am convinced, and my experience tells me, that my calculation methods are correct.

 

this is an old thread but I was reading it any way. The way I figure gas milage ist to fill up then drive to half a tank or beyond then fill again. The amount of gas i put in the second time is the amount of fuel to divid the number of milage driven. basicly I zero my milage counter each time I refill. Thats how I found out my numbers. I do that every time I get gas. I sure miss my 1st gen MT base honda fit. It got 40 on the hwy all the time and seldom went below 38 after break in. Around town was near 35 frequent. It was hard for me to believe I drove a trip 0f 46.4 mpg but I am the only one that fuels the car up.... mmm. why is there such a big difference in that car and the one I drive now that is an automatic? Break in? transmission? car weight? is it just normal variation?
if your a none believer I am sorry to see that. I have found much of what people post is true. Its true even if its subjective. perhaps a few people dont use good technique for counting numbers also.
I find it intresting that I owned a diesle VW and those numbers where consistant but not with the honda Fit. My VW did 40 mpg and more around the city. fifty mpg and more on the hwy

 

07' AT GD3 I got 45.3 mpg on a road trip the other week. I was doing 70 when a semi passed me. I followed him for about 240 miles doing 75-80 mph and achieved the 45 mpg. I was surprised and excited. My little fit was smashed when I bought it with 133k on it. Now she's back to looking stock and has 16 inch rims. I love this little car. Typically I see 36-38 on the highway. I even had the ac on for some of the trip that I got 45 mpg.

 

the further you drive the better the mileage you will get.

 

i wish i could get 45mpg!

 

Driving my 2007 Honda Fit Sport back from Binghampton, NY to Reading, PA with my daughter after a volleyball tournament, I was able to attain 47 MPG. And when I regularly go long highway miles, such as to Lancaster or Harrisburg, PA I can get around 45 mpg. That is driving the speed limit (65 mph at some points and 55 mph at others.

However, normal city/suburbs driving I get anywhere from 26 to 32 mpg.

BTW, the only vehicle I owned that got better gas mileage consistently was my Chevy Sprint Plus, which on highways got me over 60 mpg! Of course, it was a 3 cylinder engine.

 

Things may be different here in the UK but My 2005 Honda Fit/Jazz was managing anywhere between 42 and 63mpg.
Even with a heavy foot it would still be just over 40mpg.

Forgive me, i am not aware of the differences between engines and fuel between the UK and US but it does seem a big difference.

 

UK spec vehicles are almost always a good chunk lighter in weight, less or no emissions equipment that rob horsepower and engine efficiency, and honda generally is good at using smaller motors for similar performance and purpose

Bottomline, you want your car with our motors lol


If your car is the 1.3liter twin plug per cylinder model, that is a high efficiency model and will get great mileage regardless of the weight of your foot lol

 

Does't thou use the Imperial Gallon for calculations? IDK how it works over there in Britannia.

 

I've got my own MPG tracking thread that I started when I bought my used (99k) Fit last month. I've been overly specific in detailing driving conditions. I only fill up the tank to the first off click of the pump handle, so it's pretty consistent. I've been tracking using Fuelly and have detailed every one of the 10 fill ups that I've made. None of this "I got 45 mpg on the highway the other day" sort of stuff.

I almost got to the 45 mpg mark last week. 44.653. I was <> this close. It was only for 104 miles and 2.33 gallons. I feel pretty sure that had I continued the trip on the interstate, I would have probably broken 45. But that's as far as I went before I had to exit the interstate and drive on back roads. I'm at 29.2 combined with a 60/40 city to highway driving. This is approximate as I don't track down to the mile when it comes to estimating which type of driving I'm doing, but I do keep a rough track of how many miles I'm doing of each (I'd say that there's probably about a plus/minus of 5%). However, in this case, it was, with the exception of the 3 miles it took to get to and from the gas stations from the interstate, 105 highway miles exclusively.

 

I've been tracking my mpg since I purchased my '07 several months back and the last tank recorded 47.9! I was very surprised as the highest I've seen before that was 36. I do admit I employed some hypermiling shenanigans such as coasting as much as possible, timing stoplights so I didn't come to complete stop, and a couple engine off coasts. Roughly 80% of this tank was city driving and I shifted before 3k most of the time although day before I filled up I did a WOT run through 3rd. Really pleased with this car.

 

I have owned my 07 Fit since new and have never gotten mileage above 35 MPG. Usually it is closer to 30 MPG because my wife drives the car on short trips around town with the AC on here in Texas.

 

Last three tanks have returned me 44.6, 45.8 and 46.7 MPG.

The 45.8 tank was almost entirely my 34 mi round trip commute to work and back. I don't believe people who don't give specific numbers.

 

I barely break 32mpg.

 

Location: San Francisco, CA

I'm not surprised at all if you live anywhere on the peninsula.

 

I think a lot of folks in this thread are giving instant mileage, not average.