Found another way to save on gas.

[Compaq888]

Well since I pumped up my tires I have been finding myself going faster than other drivers and that caused me to use the #2 lane which is the second lane from the left. Sometimes even the #1 lane. Since I pumped up the tires I'm now thinking my speedo is wrong. Since my tires are different now and are pumped up that means I'm actually going faster than what my speed says. Since I always drive 65mph on the freeway in reality i'm going 66-67mph. Not only do I gain a couple mpg by pumping up my tires but if I reduce the speed to 63mph I will be even saving more fuel because my sweet spot is 55mph. Not only that but i'll really be going 65mph. No point in speeding if there are too many benifits of going the speed limit.

Here play around with this...
http://www.miata.net/garage/tirecalc.html