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Politics : Politics of Energy -- Ignore unavailable to you. Want to Upgrade?

To: combjelly who wrote (1449)	8/11/2008 6:51:10 PM
From: TimF	Respond to of 86355

Again, each pound of underinflation represents about 0.4% loss in gas mileage. Given the Edmunds sample, and again it is likely a population who pays attention to tire inflation, they averaged 2.24 PSI underinflation. That is, again, averaged over all the tires that were checked. Going with data from your post (from Edmunds) makes it look even worse for your argument. 2.24 * 0.4% is 0.00896 or about nine tenths of a percent. Get 10 percent of all drivers to change their habits (a generous estimate of the success of any attempt to get change here) and that would be about 9 percent of a percent. But then you have to adjust for the fact that those 10 percent will not always be at precisely perfect levels of inflation, they will just be doing a better job. So you could cut that improvement in half, then I'll round up (again), and say you have 5 hundredths of a percent. 385 million gallons of gasoline every day, times .0005 is 192,500 gallons a day saved. Which at your 19.5 gallons from a barrel of oil figure would mean a savings of under 10,000 barrels a day (10k is rounding up once more, I haven't rounded down once).