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Old 05-30-2018, 04:22 PM   #91 (permalink)
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ecoDrudge - '07 Ford Fusion EU 1.6 TDCi
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Here in Northern Germany we also had up to 86 degree, maybe more. The mileage was perfect but not comfortable because I didn't use the air condition to save fuel. And when driving more than 50mph I closed the windows to reduce air resistance. But the result was great. I nearly reached the best mileage since I have this car.
I wonder which influence the humidity has. Here we haven't got any drop of rain for five weeks now.

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Old 05-31-2018, 08:57 AM   #92 (permalink)
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"I wonder which influence the humidity has. Here we haven't got any drop of rain for five weeks now."
I have seen it effects other things burning. Natural gas stove will go from blue to a bright orange if humidity is high enough. Judging by many others reports of success on humid days I'm guessing it causes the engine to run cooler and maybe even helps prevent pinging/pulled timing.
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Old 05-31-2018, 09:19 AM   #93 (permalink)
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Found this blip as well. "Since humid air carries less oxygen per unit volume, either the driver or the ECU will open the throttle more to achieve the desired power. Larger throttle openings reduce pumping losses. Also, the effective compression ratio increases due to the large air mass entering the cylinder.
Humid air quenches (cools) combustion permitting optimised ignition advance, creating more torque from the same amount of fuel."
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Old 05-31-2018, 10:04 AM   #94 (permalink)
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My Insight runs terrible if it’s humid and below 70F, herky jerky and missing

If it’s 90F + and humid it runs great, if it’s dry it runs great
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Old 05-31-2018, 11:49 AM   #95 (permalink)
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I have a feeling it varies depending on whether its turbo/supercharged as well and other variables. Another thought is the amount of H20 in the air when humidity is extremely high is more of a mist/fog, functions similar to water injection. No clue but it sure sounds interesting.
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Old 02-11-2019, 12:59 AM   #96 (permalink)
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Quote:
Originally Posted by rmay635703 View Post
My Insight runs terrible if it’s humid and below 70F, herky jerky and missing

If it’s 90F + and humid it runs great, if it’s dry it runs great
Wisconsin has 949 sources for ethanol-free gasoline(E0), listed in pure-gas.org
That could solve some of your running problems.

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