On Dec 1, 3:21*am, wrote:
[quote]

"The U.S. Department of Energy predicts an increase in fuel consumption
of 3 percent for each 10 psi reduction in tire pressure."

[End Quote]
---

Therefore,

If the normal fuel consumption for your car is 20 mpg, with normal tire
pressure (usually 30 psi), consider the following:

If the tire on your car should have 30 psi (common), and you only have
20 psi, in one of the tires, your fuel consumption will drop to 19.4
mpg.

If the tire psi drops to zero psi, your fuel consumption will drop to
18.2 mpg. *and If ALL FOUR tires have zero tire pressure, your fuel
consumption will drop to 12.8 mpg.

-----

Now, lets look at this in reverse.

If your car normally gets 20 mpg, with 30 psi in the tires, then every
10 psi increase of air will increase your fuel milage by 3%.

Consider this example. *Raise the tire pressure in all four tires to 63
psi. *This will add 10% for each tire, thus a 40% increase in fuel
consumption. *Now, you will get 38 mpg. *Increase your tire pressure to
70 psi and you will now approximately double your fuel consumption to 40
mpg
.
Quadruple the air pressure to 140 psi, and you should get about 80 mpg
and if you increase the tire pressure to 210 psi, you'll get about 100
miles per gallon.

And while 100mpg is great, why stop there. *Lets go for 200 mpg.
Just raise your tire pressure to 420 psi

or 300 mpg
Just raise your tire pressure to 630 psi

Wanna get 500 mpg, raise the tire pressure to 1050 psi.

Drive all the way across the USA one one gallon of gasoline by raising
your tire pressure to around 2800 psi. *It's as simple as that!

Low rolling resistance tyres are available that allegedly knock up to
7% off fuel consumption.
Some of them run at 60psi.
I think they need special wheels though.

A lot of energy is lost through hysterysis in tyres.
http://en.wikipedia.org/wiki/Low_rol...sistance_tires

There are plenty of cars do 70mpg in Europe.
If you go electric, 300mpg+ (equivalent) is available.
Most have low RR tyres.

So the OP is correctish.