PSI to MPG Relationship

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In order for Americans to get the most out of their vehicles, and to decrease the amount of gasoline Americans use, we need to push and test every aspect of the modern day vehicle. According a study done by the United States Department of Energy, approximately 1.2 billion gallons of fuel are exhausted by U.S. motorists each year (Siggerud, 2007). This is over three billion dollars wasted per year.

An experiment done by metrompg.com found that inflating a vehicle’s tires by 7 psi could increase their rolling distance by 12.5%. They also state from another source that fuel efficiency is reduced by one percent for every three psi that a tire is under inflated. This equates roughly to a four percent increase gas mileage when increasing the tire inflation.

Another poster to a forum by the name of Lee posted impressive results to his daughter’s science experiment from school. He noted that they saw over a five mpg increase when they inflated the tires an additional twenty psi from twenty five psi.

In order to get the push our vehicles we will experiment with the inflation of a vehicle’s tires to determine the rate at which the efficiency of the vehicle is improved over the tire pressure increased.

Design

The experiment will involve many different digital and analog technologies to try and get the most accurate results. To start the tires of the car will be deflated to twenty PSI. They then will be driven on for ten miles from a gas station back to the same gas station. The mileage will be accounted for by the TomTom application on an iPad. The same route will be taken with the same driving characteristics. The miles per gallon will be calculated by using the receipts from filling up and the calculated mileage from the TomTo...

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L. (2006, November 23). Tire pressure science fair project. Insight Central: Honda Insight Forum. Retrieved December 07, 2011, from http://www.insightcentral.net/forums/mpg-issues/11950-tire-pressure-science-fair-project.html

Siggerud, K. A. (2007, February 9). Underinflated Tires in the United States (United States of America, Department of Energy, Government Accountability Office). Retrieved December 5, 2011, from http://www.gao.gov/new.items/d07246r.pdf

Snapshot: effect of tire pressure on rolling resistance [Web log post]. (2009, January 20). Retrieved December 05, 2011, from http://www.metrompg.com/posts/tire-pressure-rolling-resistance.htm

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