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Old 01-03-2013, 12:57 PM   #11 (permalink)
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Winter is killing me. I think I got like 36 last fillup. .I'm too scared to compute it because I know it was HORRID! I had to let some air out of tires because I needed additional grip for the blizzard. I've been too lazy to put the air back in :/

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Old 01-03-2013, 10:40 PM   #12 (permalink)
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Well good I don't feel so bad I drove the vx last couple of days we'll se how it did. The cx was down. No start no spark. Put a dizzy in and yeah all better now. I hope new life will help with a few mpgs. The cap and rotor was shot and I'm assuming I had a weak in efficient spark fingers crossed.
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Old 01-07-2013, 07:11 PM   #13 (permalink)
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Well new used distributer cap and rotor and wires all or and all very new looking for 30-40$. Good junkyard score. And last tank 36 so little happier. She's so ugly I don't want to spend any energy on the cx.
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Old 01-02-2014, 11:01 AM   #14 (permalink)
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Quote:
Originally Posted by Rusty94cx View Post
I beg to differ with the list in regards to cold tires more resistance. Hot tires sticks sticky well sticky. Witch rolls better a sticky ball or a hard ball?
Yup, it seems counterintuitive. But from the mouth of the Michelin Man himself ...

Quote:
Rolling resistance is lower when ambient temperature is high [...] between 10 and 40 C, a variation of 1 C corresponds to a variation in rolling resistance of 0.6 %.
Source: http://automotive.ing.unibs.it/~gado...istance_UK.pdf

---

And adding to the "winter sucks" meme... Wow, winter sucks: 71 mpg spring vs. 54 mpg winter in the Firefly/Metro, same trip

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Old 01-02-2014, 11:21 AM   #15 (permalink)
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Ummmmm with the weather in my part of the world my mpg figures are better than summer. my weather can change hour by hour strong winds temps from 3c to 9c then add on wind chill factor and amount of rain and how much water on the roads/streams. Roll on summer to see if my mpg goes up. i have carried out a lot of service items before winter. so was in good running order. only radical change has been a front air dam since winter arrived. will hope to carry out more mods when spring arrives and been declared fit after shoulder op to remove some bone on cavical plate to restore full movement in my arm. gives me time to do some research and buy items to crack on with mods both mechical and aero.
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Old 01-03-2014, 09:07 PM   #16 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
Yup, it seems counterintuitive. But from the mouth of the Michelin Man himself ...

Source: http://automotive.ing.unibs.it/~gado...istance_UK.pdf
While it is true that a hard plastic wheel rolls easier than a wheel with a soft rubber tire, you are looking at different materials, one of which has a miniscule contact patch and the other which has a much larger contact patch.

The drop in a tire's rolling resistance with increasing temp is likely a result of warm rubber flexing easier than cold stiff rubber. The rubber has to flex to accommodate the flat contact patch and the easier it flexes, the lower the rolling resistance. Also as the tire heats up, its internal psi also increases, reducing the size of the contact patch.
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Old 01-04-2014, 06:17 AM   #17 (permalink)
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Basjoos
that will explain why winter tyres are good below 7c and summer tyres are better above 7c. also as temp drops psi drops as well. as weather temp goes up and down is another reason to check tyre pressures i have seen a drop as high as 5psi per tyre.
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Old 01-06-2014, 01:41 PM   #18 (permalink)
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At -15F my intake was at 50F after a 10 mile drive to work, engine warmed up to 183F. Tire pressure is down 3 psi from 44psi@20F. Engine temp was at 15F when started. Avg mpg down 1 mpg to 43.5.

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