11/27 Does over-inflating the tires improve gas mileage? I tried
over-inflating the tires on my truck by 5 PSI and I hardly notice any
improvement. (It's a Jeep Cherokee.)
\_ They have a PSI rating for a reason. You're going to improve your
mileage by some meaningless amount while decreasing the life of your
tires a *lot* which means new tires sooner and increased chances of
a blowout which could get you and others killed. Stop trying to be
a genius and just do what the maniufacturer says. They know better
than you do. Put your tires back.
\_ The rating is used for average driving. If you're going on a long
driving trip, it's ok to go a few PSI over what you would use for
street driving. The PSI rating is merely an average.
\_ But the rated PSI for a vehicle takes comfort among other things
into consideration while I'm willing to sacrifice comfort. So
\_ I thought yermom was a ho only at night, not during the day.
I'm willing to put up with a bumpy ride for better gas mileage.
\_ The PSI rating sets your tires at a rate where they wear
out as safely as possible and last as long as possible. You
have shocks to ease the ride. Over inflating your tires
makes a bad blowout more likely as opposed to a regular
flat. At highway speeds you can drive your flat to the
shoulder. You might not be able to drive your blowout
safely to the shoulder. Please set your tires properly or
get off the roads you share with the rest of us.
\_ Overinflated tired on a hot day on asphault going fast = bad idea.
\_ I thought under-inflation heats up tires, not over-inflation.
\_ http://www.usatoday.com/money/consumer/autos/mauto849.htm
\_ you'll get a much bigger effect on gas mileage by slowing down
a little, especially on such an aerodynamically inefficent vehicle
as the cherokee. Other driving habits will have a huge effect on
mileage too, such as drafting big vans/trucks as well as cutting
back on rapid acceleration and unnecessary braking. tire inflation
only helps if they were underinflated (underinflation is sometimes
helpful when off-roading, as it improves traction). YMMV
\_ I have a Jeep Wangler TJ - I run 40psi on the street and 20psi
off-road. My tires are rated to 44psi, so I am still under the
limit. Also Jeep recommends 32psi, that is because they do use
the tires to help cushion your ride (everyone else here doesn't
realize what a true off-road vehicle is set up for).
Only caveat, make sure you have quality tires if you want to
play with the pressure, BFG, GY, Michelin, etc.
And yes, I do see a couple of miles/gallon difference!
And yes again, the ride is much more bumpy.
\_ Have you actually done the math on what slight gas-milage
improvements actually saves you? If you really want to save on
gas, don't drive a fucking Cherokee.
\_ Well, I'm getting 25+ mpg on freeway which is not terrible,
probably because I don't speed. Besides, I take public transit
to go to work everyday even though it takes longer than driving.
That saves more gas than driving an Insight. I'm just looking
for more ways to save gas other than getting a new car when I
need to drive to go on a trip.
\_ Wow, how do you get 25+ mpg with your Wrangler? What
year is it? I only get 12-14 mpg on mine. Also, good
advice to the guy above. If you want to get better mpg,
don't drive a cherokee. A sedan will be better for you.
\_ It's 25+ mpg freeway on the Cherokee. It's a '96
Cherokee Classic 4dr 4.0L 6cyl 5sp manual Command Trac
4WD. I think if I got the 2.5L 2WD that year it'd do
even better mpg. |
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