February 23, 2011
Is it more fuel efficient to drive 60 in 5th gear at 1800rpms vs 60 in 4th gear at 2300rpms?
I have a 2008 Ford Mustang GT manual. I want to know if driving the same speed in 5th gear with lower rpms will save me gas vs driving in 4th gear at higher rpms? Also, does driving in 4th and 5th gear constantly at lower rpms negatively affect my engine in any way?
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Filed under Gas Conservation FAQ by on Feb 23rd, 2011. Comment. 
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Comments on Is it more fuel efficient to drive 60 in 5th gear at 1800rpms vs 60 in 4th gear at 2300rpms?
the higher the gears, the less gas you use!
the 5th gear is lighter and doesnt require as much work from the pistons, less gas
higher RPM’s burns more fuel(significant) and causes more engine wear (negligible)
For the best gas mileage, always drive in the highest gear possible. If you can use your top (highest) gear at 60 (without losing speed or stalling), that’s better than any other. The only reason to use a lower gear is for acceleration or maintaining speed up a hill.
The lower RPMs the better. keep your rpms below 2000 for the best millage.