Problems with the proposed CAFE Standards for 2020. Dennis Silverman Physics and Astronomy UC Irvine. Introduction. The Senate bill on the new CAFE standards for 2020 mandates a fleet average of 35 miles per gallon (mpg) which includes both cars and small trucks (SUVs, trucks and vans).
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Problems with the proposed CAFE Standards for 2020
Physics and Astronomy
(35 - 1/3(65)) = 35 – 22 = 13 mpg.
fuel = miles driven x (gallons/mile)
fuel = 100 miles / (100 mpg) = 1
fuel standard = 100 / 35 = 2.86 or approximately 3. (Environmentally it is 3 times as greenhouse gas polluting as the best car available, the plug-in hybrid.)
¼ (1 + 3 x (7.7)) = ¼ ( 24.1) = 6.0
fs = ½(1+100/m) = 3 implies m = 20 mpg.
fs = 1/3(1+2x100/m) = 3 ; m = 25.
fs = ¼(1+3x100/m) = 3 ; m = 27 mpg.
fs = 1/5(1+4x100/m) = 3 ; m = 29 mpg.