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Old 12-14-2009, 07:48 PM   #11 (permalink)
Grrr :-)
 
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but he sees HIGHER mpg the higher the temps. that kills the AC thing.

I am just curious why I see almost NO difference and he sees such a HUGE difference over the SAME temperature changes.

now granted maybe I will also see a change now that I have a tiny car but as noted I have driven this metro in 80' temps and in 20' temps with NO apparent change in mpg beyond noise.

whats different between us? I live in PA (outside philly) and my commute is between 19057 (home) and 08215 (work)

I will have to start logging the temps as I drive.

how do you factor in the temp changes over the period of a tank? ie I fill upo every 3 or 4 days usually (multiple cars) do I just average the temps over the 4 days?

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Old 12-14-2009, 07:55 PM   #12 (permalink)
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Correction on my part: I mistook "NO" in your user info to mean you lived in New Orleans.

Trip length has a lot to do with the efficiency hit of ambient temperature. (The longer your trip, the smaller its impact.) How far is your daily drive?

Edit: Google Maps says 56.7 miles between those two postal codes. That would explain a lot.
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Old 12-14-2009, 08:09 PM   #13 (permalink)
Grrr :-)
 
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yeah 54miles actual each way I end up about 110 miles each day mostly semi city/highway

Here is a route plot that I have found the most efficient (the least number of stops all 50mph)

My Commute

I take precisely the same route in reverse to go back home. the start point is within a mile of home. yeah the no is when I was annoyed at sites asking for details so until I trust a site I fill in random stuff if it forces me to put something in IE no is "no" you don't need that :-) hehehe

what does it explain?
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Old 12-14-2009, 08:22 PM   #14 (permalink)
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Quote:
Originally Posted by Nerys View Post
yeah 54miles actual each way I end up about 110 miles each day mostly semi city/highway

Here is a route plot that I have found the most efficient (the least number of stops all 50mph)

My Commute

I take precisely the same route in reverse to go back home. the start point is within a mile of home. yeah the no is when I was annoyed at sites asking for details so until I trust a site I fill in random stuff if it forces me to put something in IE no is "no" you don't need that :-) hehehe

what does it explain?
Glad to see you trust us now... :P
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Old 12-14-2009, 08:31 PM   #15 (permalink)
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...and, there's also "engine break-in"...slowly but surely increasing MPG for no other (apparent) reason than accumulated age/miles...on both brand new engine and tires!

...also, I use "Olympic Scoring" where "highest" and "lowest" MPG values are discarded (to help reduce the "too good to be true" number flukes).
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Old 12-14-2009, 10:30 PM   #16 (permalink)
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I don't use the AC in the summer.
I also don't have "abnormal" trips in there, such as a fully warmed-up start.
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Old 12-14-2009, 10:47 PM   #17 (permalink)
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Quote:
Originally Posted by Old Tele man View Post
...and, there's also "engine break-in"...slowly but surely increasing MPG for no other (apparent) reason than accumulated age/miles...on both brand new engine and tires!
Absolutely. My average fuel economy with my new Mustang was steadily increasing over time even before I found ecomodder.com and made adjustments to my driving technique and commuting route. I can only attribute that increase to engine and tire break-in. I'm not looking forward to the FE hit I'll take when I have to re-tire it.
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The presence of traffic is the single most complicating factor of hypermiling. I know what I'm going to do, it's contending with whatever the hell all these other people are going to do that makes things hard.

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Old 12-14-2009, 11:23 PM   #18 (permalink)
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Good points about engine & tire break-in.

Quote:
Originally Posted by Nerys View Post
yeah 54miles actual each way I end up about 110 miles each day mostly semi city/highway

what does it explain?
It explains why you are less affected by falling ambient temperature than someone who lives in the same climate but has a more typical (shorter) commute.

54 miles is a long commute, and fuel economy is directly related to trip length. Google "fuel consumption" as a "function of trip length" and look through the results.
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Old 12-14-2009, 11:30 PM   #19 (permalink)
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i'm selling all my chassis dynamometers and wind tunnels on ebay.
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Old 12-15-2009, 12:33 AM   #20 (permalink)
...beats walking...
 
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i'm selling all my chassis dynamometers and wind tunnels on ebay.
...uh, was it something we said?

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