View Single Post
Old 05-01-2019, 05:18 PM   #434 (permalink)
redpoint5
Human Environmentalist
 
redpoint5's Avatar
 
Join Date: Aug 2010
Location: Oregon
Posts: 12,741

Acura TSX - '06 Acura TSX
90 day: 24.19 mpg (US)

Lafawnda - CBR600 - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - Dodge/Cummins - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Chevy ZR-2 - '03 Chevrolet S10 ZR2
90 day: 17.14 mpg (US)

Model Y - '24 Tesla Y LR AWD

Pacifica Hybrid - '21 Chrysler Pacifica Hybrid
90 day: 85.85 mpg (US)
Thanks: 4,316
Thanked 4,467 Times in 3,432 Posts
There's essentially no efficiency penalty for going up a grade at a faster speed (higher power output) with an EV except for the aero penalty of the higher speed. That equally applies to flat travel though, so there's no reason to slow down for a hill with an EV if it's capable of maintaining speed.

Gasoline vehicles tend to be most efficient at about 80% torque, and 50% of rated horsepower. I'm not sure about the BSFC for diesels, but they can probably be very efficient to the upper portion of their power rating.

The EV trucks would indeed recapture much of the energy spent climbing the grade.

EV drivers report little difference in overall efficiency with regard to climbing grades as long as the destination elevation is approximately the same as the departing location. Efficiency plummets while climbing, and is recovered on the way back down.

As an aside, many truckers are paid per mile. That means when they are going slower than the speed limit, they are getting paid less. Hills can be seen as a reduction in pay... unless you can maintain speed.

Semis in Oregon average about 60 MPH with a speed limit of 55.
__________________
Gas and Electric Vehicle Cost of Ownership Calculator







Give me absolute safety, or give me death!
  Reply With Quote