Quote:
Originally Posted by MetroMPG
Also, why did you choose 45 MPG as the "original" 65 MPH fuel consumption figure? There's no rule that says the EPA figure necessarily equals MPG @ 65 MPH. Depending on the car, real world MPG at a steady 65 could be higher or lower than the highway rating.
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The original Federal Test Cycle for the Highway portion of the EPA testing included a maximum 60 mph velocity,and averaged only 49.6 mph for the entire test protocol.
At least two additional tests have been added now which include acceleration to higher speeds.
I'd have to visit the EPA Mobile Sources website to know what they're doing currently.
There would be a date in which testing 'switched over' and newer estimates would reflect the more modern evaluations.
Better dynos are allowing more 'real world' type testing.