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Old 09-22-2012, 08:34 PM   #1 (permalink)
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Driver affects on FE

This Peterson Power document contains interesting "driver" affects on FE for fleet drivers:


...and, this is from page 5:

"All tires are at their least fuel-efficient point when new. As the new tire wears, the rolling resistance decreases and fuel economy improves."

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Old 09-22-2012, 08:48 PM   #2 (permalink)
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Awesome, I just have a couple questions...

So super-single rear tires for semi trucks... Why are they more economical? Here's my train of thought.
I read in the article that they can weigh 800 lbs less than duallies, so obviously that's going to have a big effect on starting/stopping/accelerating---but the fuel savings is also due to less sidewall flex, right?
In a setup with duallies, you're going to have two skinny tires with sidewall flex. In a super single, you're only going to have one tire's flex to deal with.
Is this right?
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Old 09-22-2012, 09:19 PM   #3 (permalink)
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The summary table on p.12 is useful. Here are two takeaways for cars:

Summer (70F or higher) Vs Winter (25F) -- (0.75 mpg) 13%
Wind / Terrain (On any given trip) -- (0.75 mpg) 13%
#2D (API 35) Vs Winter Blend (API 38) -- (0.15 mpg) 2.5%
#2D (API 35) Vs Kerosene (API 48) -- (0.9 mpg) 15%

They also claim that LRR tires are less benefit over "normal" as they approach "wear-out" ... I wonder how they know that? No citations or discussions of tests.
See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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Old 09-22-2012, 10:33 PM   #4 (permalink)
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You all are trying to correlate from big trucks to cars in this old CATERPILLAR document. It isn't straightforward. Or, where it may be, it isn't new (to this site).

CUMMINS and KENWORTH both have White Papers on Fuel Economy which have a bit more depth (I've linked them elsewhere on this site).

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