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It may very well be just my imagination, but 3 months ago i decided i can do 30 miles per hour on 3rd gear and not shift to 4th. It didn't seam like the engine was under any extra stress or anything, it was doing 2400 rpm (an around 1850 on 4th). I'm driving a 2005 C4 so my on-board PC tells me how many miles more I can do with the fuel in the tank For the month I only ever used 3rd for 30 mph I did 350 miles, but every other month before, and the two after (that I was going all the way up to 4th gear) I've been getting solid 400 miles per full tank.

Hence the question from the title: Is there correlation between fuel efficiency and preferred gear at 30 miles per hour.

Some extra info: I live in the UK, and always, always, always have my speed limiter ON.

Иво Недев
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2 Answers2

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There are two schools of though on this subject, at least in the UK. For the sake of fuel efficiency you should drive in the highest gear that your engine sounds happy with. At 30MPH in a 5 or 6 speed manual car that will probably be 4th.

The other school of thought (for the sake of road safety) is that if you stay in 3rd gear you are more likely to notice when your speed creeps up as the engine will be louder.

Sam
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As mentioned by @Sam people have two different driving habits. The important point when the higher gear is required and vice versa.

When you are driving in a highway or in the place where there is no need for any frequent change in speed you can go on higher gear with average speed is advisable. Kindly make sure to maintain the RPM not less than 1500 to avoid the damages to the engine /transmission /clutch.

When you are driving in the city or in the traffic area, you need to drive in low gear in the same time do not exceed 2500rpm. If you exceed 2500rpm the engine will be overheated and consume more fuel.

Hope this may help you to save fuel.

Shameerariff
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