Portland is a PR machine for light rail & streetcar
Here are Some Facts About Portland Oregon
“It must always be remembered how cost-effectiveness works in the public sector: the cost IS the benefit.” - author unknown
A value of 125,000 (a) is generally used as the heat content of one gallon of gasoline. (138,700 for Diesel)
If one gallon takes you 10 miles, then each mile required 1/10 of a gallon.
Expressed as an equation (Applying rules of fractions to the units):
BTU per gallon
BTU per vehicle-mile = ------------------------------
vehicle-miles per gallon
Next you can adjust for more than one passenger. (The driver of a car is a passenger, the bus driver is not):
BTU per vehicle-mile
BTU per passenger-mile = ------------------------------
passengers per vehicle
For 32 MPG:
125,000 / 32=3,906 per vehicle mile
3,906 / 1.2 passengers = 3,255 BTU per passenger-mile
For 60 MPG:
125,000 / 60 = 2,083 BTU per vehicle mile
2,083 / 2 passengers = 1,042 BTU per passenger-mile
Analysing Trimet's claimed mileage for cars and SUVs:
14 mpg:
125,000 divided by 14 mpg = 8,928 BTU per vehicle-mile. 8,928 / 8,150 = 1.10 passengers
17 mpg:
125,000 divided by 17 mpg = 7,352BTU per vehicle-mile. 7,352 / 6,712 = 1.19 passengers
a. Some sources show gasoline at 123,976 BTU/gal. (this is a difference of about 0.8%)
How to calculate BTU per passenger mile from miles per gallon
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