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Old 04-13-2013, 05:47 PM   #1 (permalink)
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Default Mild weather, improved mpg

Mild weather has returned to central PA and the mpg's are going back up.

In addition to keeping the warm-air mods for awhile longer, I'm using the metric L / 100 km display as an aid.

I don't remember who posted trying it out, but I used his suggestion & have found watching the metric display very beneficial, especially when going down grade.

I ease up on throttle just enough to indicate 1 L / 100 km (two dots or squares on the display), and mileage goes way up. On the US display I can only see the max of 150 mpg. Further easing of the throttle doesn't show any more on the display. On metric, it does, right down to fuel (near) cut out.

If I ease the throttle any more (less than 2 dots on the metric), regen kicks in and slows the car. Keeping it at 2 dots or 1 L / 100 km allows free coasting down the grade.

Good way to squeeze some more mileage out of my cvt (since I don't have lean burn like the mt's)

Getting 60's on the way up to work and low 80's on the way back (downhill), averaging low 70's round trip. Anxious to see hot weather mileage.

btw: 1 L / 100 km calculates out to 235.2 mpg.
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Old 04-13-2013, 08:24 PM   #2 (permalink)
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This thread is worthless without photos...



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Old 04-13-2013, 09:17 PM   #3 (permalink)
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With the warmer weather, while cruzing on flat terrain, ever so slightly lift off the gas, the mpgs will jump up 10 or 15, then ever so slightly get back on the gas. You should be able to cruze 5 mpg higher than you were before. I typically will overshoot my intended speed by one or two mpg then let it settle where I want it.
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Old 04-14-2013, 12:55 PM   #4 (permalink)
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Cold dry air is denser and presents more resistance, warm humid air is less dense and lighter hence less resistance and higher mpg. I'm ready for it to warm up!
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Old 04-14-2013, 01:04 PM   #5 (permalink)
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Satchel - what you said maybe completly true, however even at very low speeds i.e. 30 mph I get much better mileage at warmer temps. I think something else is also a factor.
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Old 04-14-2013, 01:14 PM   #6 (permalink)
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I think you misread my comment.

edit: I misread, you're saying something besides wind resistance at speed is a factor. I don't disagree.
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Old 04-14-2013, 01:36 PM   #7 (permalink)
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And a bigger factor.
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Old 04-16-2013, 12:17 AM   #8 (permalink)
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Quote:
Originally Posted by Cobb View Post
This thread is worthless without photos...
You're right, but being such a dinosaur it would take me several tries and much frustration (as my wife reminds me) to get the photos up.

I will give it a try.

..Bob
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Old 04-16-2013, 04:49 PM   #9 (permalink)
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I would think the oxygen content of the air is more relevant. Warm air equals less O2 which means more throttle opening for the same power output, which leads to less pumping loss. Also, fuel atomized better and burns more completely in warmer air.
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Old 04-16-2013, 08:55 PM   #10 (permalink)
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I installed the warm air mod early in the winter and ran quite a bit at 100f intake temps monitored with the obdii c&c gauge. The warm air did not seem to make much difference at all. Maybe if I had lean burn ........
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Last edited by Need4Speed; 04-17-2013 at 06:05 AM.
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