Monday, December 29, 2008


Prediction for 2009

Failing to notice that fuel efficiency has declined the past several years as gasoline prices have risen, the media will notice that fuel efficiency falls when gas prices fall this winter. They will totally ignore that fuel efficiency declines in winter due to the weather and that this year's winter has been and is expected to be especially harsh.

Fuel efficiency always declines in winter.

What's the source of that data?
EIA for gasoline consumption (finished motor gasoline supplied) and FHTA for Vehicle Miles Traveled.

Diesel (Distillate fuel oil) is not included in finished motor gasoline. I didn't add it in because diesel is used for much more than road transportation (Agriculture, mining, industry, power generation, locomotives...). It just makes the data noisy.
Oops, I meant Federal Highway Administration.
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