How fast to drive on highway for optimum fuel efficiency on 05' Civic? -

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Old 06-05-2012, 11:21 PM
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Default How fast to drive on highway for optimum fuel efficiency on 05' Civic?

I drive a canadian 2005 Civic SI sedan and was wondering how fast i should drive for best fuel efficiency. Usually i follow the speed of traffic in the fast lane reaching around 75 mph, but should i not be driving that fast in a civic?
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Old 06-07-2012, 07:12 AM
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Well im not too familiar with your model of civic, but take a look at you tach and se what rpms youre turning at that speed. In my 97 at that fast im turning abuot 3.5k rpm which i know kills my mpg. I can reach almost 40 mpg when i average around 60 mph without much city driving.
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Old 06-23-2012, 11:08 AM
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Sometine I did an experiment for a month. Driving 5 or 10 MPG under the speed limit. It helped me to save some gas and achieve better fuel efficiency.
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Old 06-25-2012, 05:05 AM
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Location: Maryland
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If you can do around 55mph, you're probably in the sweet spot for gas mileage. Above that speed, the wind resistance starts multiplying exponentially, and your car has to work a lot harder just to overcome the wind resistance at 70 than it does at 60. Above 55mph, here's how your efficiency calculates (on average):

- 3% less efficient at 60 mph
- 8% less efficient at 65 mph
- 17% less efficient at 70 mph
- 23% less efficient at 75 mph
- 28% less efficient at 80 mph

So by you doing 75mph, you're already using 23% more gas than you would if you'd have stayed in the slow lane which, on your car, is something like 10mpg.
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