Taller tires = better MPG? - Page 2 - Fuelly Forums

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Old 12-21-2006, 04:51 PM   #11
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I drive a 2000 Escort ZX2. I used to have a Geo Metro and I still get emails from MetroMPGs site on what he is up to :P.

Anyways, I ... (takes a deep breath) can admit to being a bit of a fuel economy geek. The current tires on my car are 205/55/15's . And slowing my commute from 75 mph to 55 would help my fuel economy but add alot of time to my work commute.

My tires are wearing low and its time for some replacements so I wanted to see if I could get some better fuel economy by getting taller tires. I thought of getting thinner tires but does thinner tires mean that I need to buy rims or can a go a few sizes smaller on my current rims?

Thanks for all the replies
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Old 12-22-2006, 03:27 AM   #12
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those tires are already taller than stock size on the zx-2 i have a 99 and my tire size is 185-65-14.
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Old 12-22-2006, 07:14 AM   #13
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185/65-15 would be the exact same hight, and would leave your speedo working exactly as it is now as well, the 185/65-15 would simply be 20mm narrower section width (not tred width, tred width varries, altho narrow section width makes narrower tred more practical) and they look like they will fit 5-6.5" wide rims, so dependong on what you have, they could work.
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Old 12-22-2006, 07:17 AM   #14
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Thirteen odd years of Metro driving showed me bigger tires than 145R12 hurt mileage....
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Old 12-22-2006, 07:43 AM   #15
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Quote:
Originally Posted by MetroMPG
Which would of course make aerodynamics worse, possibly cancelling the benefit of lower engine RPM (Of course you could try to go taller, but narrower...)
Even if you don't go taller but do go narrower, you'd likely see a benefit...I've tried it and believe this to be true.
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Old 12-22-2006, 12:58 PM   #16
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those tires are already taller than stock size on the zx-2 i have a 99 and my tire size is 185-65-14.


I have one of the rare Escort S/R's. Ford only made 2,000 of them between 1999 and 2000. The S/R escort is lowered 1'in and has some engine/exhaust enhancements and also came with the larger rims. I love the car but being a former Geo owner I would like to squeeze some efficency out where I can.
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Old 12-22-2006, 01:09 PM   #17
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what kind of mileage are you getting now??
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Old 12-22-2006, 08:24 PM   #18
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Quote:
Originally Posted by SVOboy
He said 75mph 180 miles a day.
ah yes, then i vote aero mods whole heartedly. especially at 75mph. aero mods will give the greatest benefit!
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Old 12-27-2006, 08:51 AM   #19
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My current MPG is 33 to 35 MPG.

Mrs.Clause got me a Pro-Scan OBDII scanner for Christmas too . Can't wait to start screwing around with things to see what improves my MPG
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Old 12-30-2006, 05:34 PM   #20
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Quote:
Originally Posted by BeoWolfe
I drive a 2000 Escort ZX2. I used to have a Geo Metro and I still get emails from MetroMPGs site on what he is up to :P.

Anyways, I ... (takes a deep breath) can admit to being a bit of a fuel economy geek. The current tires on my car are 205/55/15's . And slowing my commute from 75 mph to 55 would help my fuel economy but add alot of time to my work commute.

My tires are wearing low and its time for some replacements so I wanted to see if I could get some better fuel economy by getting taller tires. I thought of getting thinner tires but does thinner tires mean that I need to buy rims or can a go a few sizes smaller on my current rims?

Thanks for all the replies
Beo, I have a 99 ZX2. If I were you I would put 205/75/15 on your car. There is no doubt in my mind that this would improve your FE at the speed you drive. Your speedo would register 65 when you were going near 74.

If your RPM at 74 is 3200 this would lower to 2800 at 74mph. Your engine has enough torque to handle this OK and it definitely will help mileage. Look at DiscountTire.com. CO ZX2
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