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Old 12-09-2016, 04:03 PM   #11 (permalink)
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The wiper delete, I don't know--although it is worth noting this is the only exterior difference between the (50mpg highway) Prius and (53mpg) Prius Eco. Removing each mirror takes around .3 ft^2 off the frontal area, probably around .005 off the Cd, and looks a lot cleaner.



Both mirrors off, pizza pan wheel covers, no rear wiper, 1.5" lower, foam grill block, and some underbody paneling is good for Cd .21.

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Old 12-09-2016, 04:24 PM   #12 (permalink)
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Both mirrors off, pizza pan wheel covers, no rear wiper, 1.5" lower, foam grill block, and some underbody paneling is good for Cd .21.
Is this by calculation, estimation, measurement or just a WAG?

Simon
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Old 12-09-2016, 10:55 PM   #13 (permalink)
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Well looking at my five year cost of ownership chart over the civic with oil consumption factored in (basically an always 6mpg hit), i've got some distance to make up! So i've ordered the grommet for the rear wiper delete, block coolant warmer, iphone compatible smart programmable socket. Already have a scan guage. Hopefully this will help my 5am 18F commute I had yesterday especially since it's supposed to hit the single digits next week . I can fine tune my target temp by using the scan guage so we'll see.
Also did some weight reduction: Removed the carpet mats, trunk mat, trunk tray, spare tire and kit, owners manuals, no wiper fluid lol. *Feeling optimistic*
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Old 12-10-2016, 01:26 PM   #14 (permalink)
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Grill block would definitely be on my to-do-soon list with temps that low. Blocking the whole thing should be fine.
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Old 12-10-2016, 11:50 PM   #15 (permalink)
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I just took a trip home. Checked my tires and they weren't all at 50psi, so I rechecked all of them and aired them up, 43F temps, driving SW, and with the small weight reduction, and the passenger mirror folded in I got 45.6mpg trying to maintain 75mph for 200 miles. Definitely feeling much better about the car now.
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Old 12-11-2016, 11:52 AM   #16 (permalink)
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So does anybody still make rear wheel skirt covers for the 2010+ Prius? I'm planning to get these to install and have a small tire in the rear. Looking at the VW XL1 I saw that it had matched its mm of tread per pound front to rear with a set of staggered tires.
With the weight of the XL1 @ 1753 lb, 45% F bias (@ 788.85 lb) with a 115 mm tire, 55% R bias (@ 964.15 lb) with a 135 mm tire.
This works out to:
Front: 115 mm / 788.85 lb = 0.1458 mm/lb
Rear: 135 mm / 964.15 lb = 0.1400 mm/lb

The prius has a 3042 lb curb weight stock with a f/r (%), 60.2/39.8.
Front: 195 mm / 1831.284 lb = 0.1065 mm/lb
Rear: 195mm / 1210.716 lb = 0.1611 mm/lb

Going for a 195 up front and rear options:

Option 1: 175/65/15 Michelin Energy Saver a/s
Option 2: something small too that will fit on the oem wheel but with the rolling resistance of the infamous re92
The new prius eco has enasaves, so enasaves or energy saver a/s? hmm...
Any Thoughts?
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Old 12-12-2016, 01:45 AM   #17 (permalink)
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Quote:
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Is this by calculation, estimation, measurement or just a WAG?

Simon
Coastdown testing. Cd .212, Crr .010.
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Old 12-12-2016, 02:09 AM   #18 (permalink)
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Thanks. Did not even think about coastdown. Pity there is nowhere arounfpd here suitable.

Simon

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