3 ms·

Going at a steady 30 mph on a straight, level road is not really something people do in my part of the world, so I can't say that I have experience to know what

Going at a steady 30 mph on a straight, level road is not really something people do in my part of the world, so I can't say that I have experience to know what sort of gas mileage you'd get. Edit: More research suggests that gas mileage should be similar between 30 and 60 mph, it kind of plateaus, but I guess that means power required would still go up proportionally. 10 hp is something I was remembering from reading something about driving at around 60, so I guess 30 mph should take 5 hp.

mrguyorama 7y ago
In about the 80s, cars were rather more efficient at 50mph. Depending on brand, market segment, and transmission, I'd believe they are roughly as fuel efficient at higher speeds. My car (2.0L turbocharged hatchback) uses about 7-14kw to maintain 60-70mph on level ground at around 30-33mpg. The unfortunate uncertainty in my figures is due to poor memory