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View Poll Results: What is your MPG
0-10 10 0.39%
10-20 90 3.51%
20-25 524 20.46%
25-30 987 38.54%
30-35 689 26.90%
35-40 209 8.16%
40+ 52 2.03%
Voters: 2561. You may not vote on this poll

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Old 09-15-2009, 07:15 PM   #551
ViperThreat
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Depends on my driving style.. Ive seen high 30s with my SVT when driven right.
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Old 09-19-2009, 07:34 PM   #552
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i lied on last post i realized its not 103,xxx its a shade under 109,800 once i got home from work today
Every 5,000 miles
Oil and Filter

Every 15,000 miles
Seafoam
Spark Plugs(copper core)

Every 20,000
Fuel Filter

on a 13.2 tank where the light comes on basically after 11 gallons have been used i still get 262 miles (23.xxMPG) not that great but appropriate to the way i drive it every dayand the bolt ons i have
everday the car goes through
stop and go,highway, on and off ignition between the 8-15 stores i do a day for my job that are all 5-10 miles apart in Daytona
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Slow bolt ons added or bolt ons slowly added?
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Old 09-19-2009, 10:06 PM   #553
DUJALA
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For my first 600 miles I'm looking at about 30.6.
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Old 09-19-2009, 11:51 PM   #554
calvin1234
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Quote:
Originally Posted by DUJALA View Post
For my first 600 miles I'm looking at about 30.6.
Is that all around mileage? If so sounds about right. After she is broke in you will pick up a mile or two.
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Old 09-26-2009, 11:43 PM   #555
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05 ST. Tires inflated to 39 psi. Drive very soft, shifting at or before 2000 rpms. Usually get 30 or 31 with about 75 percent city.

Overall
28/29 city
35/36 highway.

I've been recording mileage at the gas pump, the old fashioned way for the past year and a half. My next cars going to be a hybrid.
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Old 09-27-2009, 04:12 AM   #556
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Why would someone inflate their tires beyond what is suggested for simply a small mpg gain? I can think on a number of negative effects that would cancel out any mpg gain.

-- Uneven tire wear
-- Higher tire temps leading to more wear and increased possibility of blow outs
-- Increased possibility of accident due to less traction because the tire doesn't have an even patch of tread on the ground (more on the middle, less on the sides)
-- Increased wear on suspension and higher possibility of bending a wheel due to less energy being adsorbed by the tires (harsher ride)

There might be others but these are all I can think of for the moment
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Old 09-27-2009, 10:15 AM   #557
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You have decreased tire wear with the higher tire pressure. Lower tire pressure increases tire wear.

I've noticed a small change in braking time.

I inflate them to 39, because I like the firmer ride, better mpg (1 mpg better), & I'm trying to get my tires to at least 40k & possibly beyond. Also I like the decreased resistance. With tires at 34 it feels like when I biked around with a low tire & required much more effort. With increased tire pressure you sail along with much less overall effort.

34 is the minimum, so 39 is hardly excessive. I know many who inflate to 10 over, which would be 44 for the focus.

Last edited by everwinter; 09-27-2009 at 10:25 AM. Reason: addition
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Old 09-27-2009, 10:43 AM   #558
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32 is what is on the doorjam on my Focus
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Old 09-28-2009, 01:22 PM   #559
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2005.4 ZX5 SES 2.0L Duratec 121,000KM+
91 OCT FS Box Tune @ 6% lean, header, short ram CAI, Brisk sparks, highflow magnaflow from header.

City hard driving 32 GPM
Highway med driving 45+ GPM
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Old 09-28-2009, 04:21 PM   #560
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Tire pressure effects

Quote:
Originally Posted by calvin1234 View Post
Why would someone inflate their tires beyond what is suggested for simply a small mpg gain? I can think on a number of negative effects that would cancel out any mpg gain.
-- Uneven tire wear
-- Higher tire temps leading to more wear and increased possibility of blow outs
-- Increased possibility of accident due to less traction because the tire doesn't have an even patch of tread on the ground (more on the middle, less on the sides)
-- Increased wear on suspension and higher possibility of bending a wheel due to less energy being adsorbed by the tires (harsher ride)
With higher pressure and less deflection, the tire should run cooler.
The higher pressure effect on traction varies by the tire model.
Higher pressure results in less chance of bending a wheel, since a severe bump (such as a speed bump) deflects the tire less. This is important, especially for low profile tires.
My observation is that manufacturer pressure label for most cars is designed for a cushy ride, and higher pressure results in better handling and economy.
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