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Old 11-26-2013, 04:20 PM   #1 (permalink)
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Tire pressure set lower, MPGs went up? (Winter thread)

For most of the trip legs out of 11.7 miles today, I was getting rather low MPGs partially due to high tire pressure (About 55) and then I stopped at the gas station and set the tires to 46 all around; Then, For the trip home I got the highest MPG figure all day and I did feel more confident about accelerating at higher engine loads; It also helps that I can accelerate at all since I had trouble going up hills earlier! However, This isn't an A-B-A-B test on the same leg of road. But, I thought I'd share the thought.

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Old 11-26-2013, 04:26 PM   #2 (permalink)
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According to Darin's testing, 46 to 55 psi shouldn't make a huge difference is rolling resistance (obviously it differs from tire to tire, but still should be an okay general rule). I'd be more likely to blame a tail wind or something.

http://ecomodder.com/forum/showthrea...tire-2721.html
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Old 11-26-2013, 04:53 PM   #3 (permalink)
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There's a reasonable chance that it was something else that changed and improved your mileage. But it's worth a re-test, I think!

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Old 11-26-2013, 05:10 PM   #4 (permalink)
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Engine temp with the candlestick in the dining room?
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Old 11-26-2013, 05:40 PM   #5 (permalink)
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Yeah, It's far from A-B-A-B testing and the van started at about 30 FWT. Though I can say with 55ish PSI, I did not accelerate very well in that snow with the methods I tried and setting it to 46 gave it more traction and it made it feel about the same as the day before.

And jakobnev, I'm not sure what you mean.
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Old 11-26-2013, 06:04 PM   #6 (permalink)
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MPGs

According to published findings by SAE,an automobile is not fully warmed up until after 22-miles of continuous operation at 50-mph.Only then can you BEGIN testing.
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Old 11-26-2013, 06:59 PM   #7 (permalink)
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High tire pressure and wheel slip in the slick weather, or didn't you get what we got in NEPA?
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Old 11-26-2013, 08:36 PM   #8 (permalink)
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Quote:
Originally Posted by aerohead View Post
According to published findings by SAE,an automobile is not fully warmed up until after 22-miles of continuous operation at 50-mph.Only then can you BEGIN testing.
This.

I've been keeping an eye on my fuel usage per hour at idle, and I don't drop to regular summer usage until after 15 min of coolant being 190+. Engine oil temp is my suspect.
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Old 11-26-2013, 09:53 PM   #9 (permalink)
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When I was running winter tires on my civic years ago I would get some wicked wheel hop while spinning due to ice and snow at 55psi, dropped it down to 45ish and the wheel hop went away. Traction during a slide may have gone up (butt-o-meter not any skid testing) but I did not note any significant difference in traction while not skidding (which matches the science I have seen regarding tire pressure and traction). Nor did I note any mileage change as during the winter road conditions and driver technique totally wipe tire pressure rolling resistance changes away.
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Old 11-26-2013, 10:50 PM   #10 (permalink)
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Quote:
Originally Posted by aerohead View Post
According to published findings by SAE,an automobile is not fully warmed up until after 22-miles of continuous operation at 50-mph.Only then can you BEGIN testing.
I didn't know that, Thanks.

Quote:
Originally Posted by Mad Adder View Post
High tire pressure and wheel slip in the slick weather, or didn't you get what we got in NEPA?
I did get slushy roads, The whole slipping thing is partially due to inexperience and, Frankly, Learning the hard way.

Quote:
Originally Posted by ksa8907 View Post
This.

I've been keeping an eye on my fuel usage per hour at idle, and I don't drop to regular summer usage until after 15 min of coolant being 190+. Engine oil temp is my suspect.
I'm now wondering if I should add more to the grille block.

What are some suggestions for engine insulation? I think Frank Lee made one out of styrofoam.

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