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Old 01-13-2009, 08:17 PM   #15 (permalink)
Renaissance Man
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Join Date: Jan 2008
Location: In the Northeast dreaming of the Southwest
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Aegean C - '17 Honda Civic LX
90 day: 41.28 mpg (US)
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Thanks for collecting and posting this data. This is motivating me to do a similar test for my car.

Originally Posted by MetroMPG View Post
You can tell from the graph that the shift from 3rd to 4th (with torque converter lockup) happens between 60-70 km/h (shifts right in the middle at 65 km/h or 40 mph, actually).

It's possible to bleed speed down to 60 km/h and then hold 4th gear there, which would have raised that MPG point on the graph quite a bit, but I didn't. The transmission will downshift at the slightest prod under those conditions.
This sounds just like my car. There is a straight and relatively flat stretch of road about 1 mile long in my daily commute. The speed limit is 35 mph, I try to go just fast enough to get the TC locked and keep it there, which is about 37-38 mph (~60 kph) at just a shade under 1500 rpm. This requires a very delicate touch with the throttle, and careful monitoring of the TPS. On my way to work the car is not fully warmed up yet, usually just hitting the 150*F coolant temp required for lockup, and the road is very slightly uphill in this direction, and I see mpgs in the low 30s. On my way home the car is fully warmed up and has the slight grade working in it's favor, and I see low-mid 40s, as high as 50 mpg in warm weather with summer fuel.

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