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Old 02-11-2013, 06:28 PM   #11
roderunner
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Overinflating the tires will improve MPGss but wearing them out quicker will cost you more and with a smaller contect patch you also have less grip in corners. Don't overinflate.
Yes and no. Manufacturers often set tire pressure lower than optimal to improve ride comfort, since tires are also an integral part of the suspension system. A good way to actually check for overinflation after setting your desired pressure is to chalk a line across your tires and roll your vehicle one or two revolutions in a flat parking lot. The chalk will leave a (witness) mark on the asphalt -- if a tire is overinflated, the line will not span the full width of the tread. In that case, drop your pressure and try again until the mark looks good. By using this technique you can see how far the tire pressure can be raised without overinflating.

It's also interesting to note that pressure can fluctuate more than one might imagine. My Jeep has a direct readout TPMS system so it is possible to monitor pressure continuously in each tire. Driving from San Diego to Phoenix for example, it can vary up to 7 PSI gain due to
1. internal friction (1 to 3 psi)
2. air/pavement temperature increases (up to 4 psi)
3. solar contact (1 or 2 psi)

So "cold inflation" specs would ideally be set before driving and not in the sun. If it is necessary to air the tires at the gas station for instance, you should add 2 or 3 psi to your target pressure -- you can bleed any excess off later after the tires have cooled off.

I typically set about 38 PSI cold. This should help the mileage fractionally without overinflation while insuring the pressure doesn't rise above 45 MAX after potential gains, yet going no lower than recommended after a month of natural bleed off or cold spell.
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Old 02-11-2013, 06:37 PM   #12
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The MK3 Focus dont have TPMS correct?

Looking at getting lightweight wheels and LLR tires for summer/when the all season wear out on my stock 16in wheels.
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Old 02-11-2013, 06:57 PM   #13
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The MK3 Focus dont have TPMS correct?

Looking at getting lightweight wheels and LLR tires for summer/when the all season wear out on my stock 16in wheels.
They have TPMS as required by law for new cars afaik.

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In the United States, the United States Department Of Transportation (NHTSA) released the FMVSS No. 138, which requires an installation of a Tire Pressure Monitoring System to all new passenger cars, multipurpose passenger vehicles, trucks, and buses that have a gross vehicle weight rating (GVWR) of 4,536 kg (10,000 lbs.) or less, except those vehicles with dual wheels on an axle, as of 2007.
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Old 02-11-2013, 08:22 PM   #14
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They have TPMS as required by law for new cars afaik.
All systems activate an alarm if the pressure drops too low (usually about 25% below recommended pressure). I believe most (if not all) have a high pressure alarm also. Some vehicles can display the actual pressure but the Focus apparently doesn't offer that option.
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Old 02-11-2013, 08:39 PM   #15
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Can you scan or turn them off?
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Old 02-11-2013, 08:42 PM   #16
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Can you scan or turn them off?
No, the system cannot be disabled even via the factory IDS scan tool. You can run the car without them but it will send out an annoying warning message and a chime upon start up and the TPMS light will be on all the time. You can get a set of sensors off of ebay for less than the retail asking price usually, but you have to make sure its the correct valve stem mounted sensors in the right frequency range. Tire rack says 315 mhz should work.
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Old 02-11-2013, 08:54 PM   #17
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Darn, thanks for the info dude - I will just get sensors with the new wheels from tire rack when the time comes..
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Old 02-11-2013, 09:25 PM   #18
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You can also do a front skid plate and rear diffuser to help the air flow. I picked up an average of 7mpg with mine.
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Old 02-11-2013, 09:27 PM   #19
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You can also do a front skid plate and rear diffuser to help the air flow. I picked up an average of 7mpg with mine.
Links or more info on that?

I know thats a package with the fiesta when I was looking into that model..
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Old 02-11-2013, 09:34 PM   #20
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Achieved with steeda cool air intake and short throw shifter and I dive like a grandma and run wawa 92 octane
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