How much bhp required at a steady 70mph cruise?

How much bhp required at a steady 70mph cruise?

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Matt UK

Original Poster:

17,723 posts

201 months

Monday 22nd September 2014
quotequote all
I'm just curious on this one.

My thinking is linked to hybrids which use electrical energy at low speeds and then petrol at higher road speeds.

Also I remember giving a lift to a passenger in a Jag XJ and with the cruise on at 70mph at 1,750 rpm he commented that the car was probably only using 70bhp - I genuinely would have no idea.

To keep it easy, the car is a modern 1,500kg saloon.