Originally Posted by bwilson4web

Hi,


I picked up the following graphs from:

Gyenes, L. and Mitchell, C.G.B., "The Effect of Vehicle-Road Interaction on Fuel Consumption," Vehicle-Road auto body part Interaction, ASTM STP 1225, B.T. Kulakawski, Ed., American Society for Testing and Materials, Philadelphia, 1994, pp. 225-239.

Tire inflation lookup table:

kN/m**2 - psi

200 - 29

225 - 33

250 - 36

275 - 40

300 - 44

325 - 47

350 - 51

375 - 53

Speed lookup table:

km/h - miles per hour

80 - 50

90 - 56

100 - 62

110 - 68

120 - 75

Vehicle drag is a function of rolling resistance and drag times the velocity squared. However, tire rolling resistance is not a linear function with speed and these charts give a clue.

Bob Wilson