For years tire companies have told you that you can improve fuel economy by x% or y% if you only ensure that your tires are properly inflated. These figures on MPG improvement are based on historical numbers based on studies that show a majority of motorists are running their tires underinflated. I always felt that while this was true it really didn’t mean much to the average driver as you only know your mpg fuel economy after keeping records and doing math. Also when you drive or tow a big rig and are only getting 5 to 8 mpg, who cares about an improvement in 0.175 mpg?
I decided to take a different approach. With fuel prices at the $4 level a 2.5% improvement in mpg economy really translates into a 10¢ per gallon savings. Now that is something we all can relate to. I know when I have a choice between two stations with one selling fuel at $3.95 and another at $3.99 I don’t hesitate at going to the one that is 4¢ lower so I am sure that if I saw a 10¢ difference I would definitely make the effort to get to the lower cost pump.
As I point out in the video this savings is based on the fact that over 50% of RVs, cars and trucks have one or more tire underinflated. The technical term for the tire’s contribution to fuel economy if Rolling Resistance, or the force needed to roll the tire based on its operating load and inflation. Higher “RoRo” translates into more force needed to just roll down the road. If you don’t think this can be significant jsut think of pushing a loaded wheelbarrow with it’s single tire significantly underinflated or perhaps a bicycle with one tire 20% low.
With six to 12 tires depending on what type or RV and tow vehicle you have it only takes a few low inflation tires to hit you hard in the pocket book at your next fuel stop.