Has anyone tested how much efficiency you gain using 50 or 45 psi versus 40?
I claim to be able to roughly calculate the fuelsaving.
For that I concluded next .
Rollong-resistence makes about 25% of the fuelconsumption when driving 80km/50mph, with the calculated needed pressure for the load on tire and max speed of 160kmph/99mph.
2 times the speed gives 2 times fuelconsumption for the not rolling resistence part( the 75% is 100% minus 25% rolling resistance part. The rollingresistance part stays the same/ mile( 2ceas much cycles a second , but also 2 ce as much distance.
2 times the deflection gives 2 times heatproduction of tire, so 2 times fuelconsumption for the rolling resistence part.
2 times as much surface on the ground gives 2x2=4 times as much deflection, so quadratical relation.
For electric cars read energy use for fuelconsumption.
Example : energy use 1 k- watt / mile.
Constant speed 75mph.
Pressure calculated for weight and 99mph 35 psi.
Then 0.25kW/ mile used for rolling resistance
Now 75mph/50mph= 1,5 times as fast so 1,5 times 0.75kwh For rest is 1.125kwh/ mile+ 0.25kw/mile is 1.375kW/ Mile at the 35 psi.
Now 40 psi only rollingresistence part chances. 35/40= 0.875 as much surface on the ground, so 0.875^2= 0.765 as much deflection so 0.765 x 0.25kW/mile= 0.19 kw/mile. Rest was 1.125 + 0.19 = 1.315kW/mile.
1.315/ 1.375=0.956 so energysaving 4.4% .
All verry rough , but gives an idea.
If you give the real data, I will make a new calculation.
I can also calculate that pressure for you that gives the 25% for 50mph.
