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gone-ot · 12-08-2015, 02:44 PM

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.

12-08-2015, 02:44 PM	#1 (permalink)
gone-ot ...beats walking... Join Date: Jul 2009 Location: . Posts: 6,190 Thanks: 179 Thanked 1,525 Times in 1,126 Posts	"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.