Just did a quick test: cruised down a flat road at 45mph.
4th gear I was at around 2100rpm and the cluster said I was getting 44mpg.
5th gear I was at around 1600rpm and getting 46mph.
6th gear I was at around 1300rpm and still getting 46mph. However, every slight imperfection in the road caused it to dip as low as 39mpg while in 6th gear, meanwhile 5th just cruised along with the occasional dip to 44mpg.
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i just did a quick test and was cruising down the road in 6th gear at around 45 mph (sometimes down to 42 sometimes up to 48.) getting 65+ mpg. When I came to a hill, not a dip, or an imperfection, but a hill
, I gassed it a tad to keep the speed up before getting there and the mpg went down to the 40s. At the top of the hill, off the gas and the mpg was 75+.
I drive the same stretch of road every day and I do it in 5th sometimes and I get good mpg mostly 40s and 50s and stuff but you have to gas it a lot more, so I don't see how that can be more "efficient".
So I dunno maybe new engines don't perform as well or not as good in 6th gear. Maybe you're just gassing it at the wrong time.
Of course 5th and 4th at that speed seem to be much more responsive, and more managable, however I don't see the similar mpgs as you do.
my jeep just seems to love rolling around in 6th pulling up and over all the little hills. I don't know that I have any "flat" stretch of road to try it on, as most of the stuff around here is hilly in one way or another.
I know that when I started using 6th gear around here my average efficiency went up around 3-4 mpg (calculated on odo/tanks)