I did my first fill today.
I picked up my car with 15km on the odo so I subtracted it from the total before figuring it out. And I do not know how full the dealer filled it.
527km traveled city/highway
327 miles
34.42 litres filled (I filled to one more click after it stopped)
7.58 Imperial gallons (9.09 U.S gallons)
327 divided by 7.58 = 43.13 mpg Imperial or
= 35.97 mpg U.S

I am very pleased. My V10 would have gulped down over $250 to do the same thing.
I am going to assume this will improve slightly as the powertrain breaks in.
Very effecient!

 

The Fit is GO!

 

Our first two tanks after getting rid of the dealer "full" tank was 35.67 and 34 even with my wife driving our MT Fit Sport. I'm really happy. I was just hoping for 30 or so like my Saturn SC2.

 

I filled up my first tank too, last Saturday. I got just under 33 mpg, about 2/3 city driving. I didn't even have to try hard!

I didn't modify any of my old A/T habits, like coasting to a known stop, no rocket launches, etc. Some new M/T ones like trying to be in 5th gear if I'm cruising above 60 km/h (~38 mph), shifting by 2500 rpms, etc.

Once I'm more comfortable with M/T I'll try some more fuel-saving techniques. I'm maintaining a spreadsheet to keep track of my per-tank mileages.

I have to remember to simply stop at the first click when filling though; I threw my numbers off by putting more into the tank after the click (how much more can it take after the first click anyway? I chickened out after 2L).

 

Just got my base MT and on the first tank, mostly highway, got 39.7mpg. Joy