|
"Old" GPM (1/MPG) equation
Don't know how relevant it might be to *current* vehicles, but back in 1961-1967 a Ford Motor Company engineer came up with this logarithmic-form equation for estimating fuel consumption (161 car-sample):
c = K*(wt^0.3067)*(cid^0.3469)*(ar^0.3395); R^2 = 0.932
where:
c = gallons-per-mile
K = 5.248 x 10^-4
wt = weight in lbs.
cid = cubic-inch displacement
ar = axle ratio
• source: SAE Automotive Fuel Economy, Vol. 15 (PT-15), 1976, "Factors Affecting Vehicle Fuel Economy," by Clayton LaPointe, Ford Motor Company, page 105.
|