I have a '94 NA manual transmission 850 sedan. I tend to shift at around 2000 rpms unless I need to accelerate more quickly. If I'm not accelerating and just cruising at say 40 mph I definitely drive in 5th gear with the engine running at lower than 2k rpms. After just reading an ancient thread about gas octane in which someone mentioned that running at higher rpms will keep the valve train cleaner I'm wondering if I should change my shifting habits?
I do a lot of highway driving so it's not like my car doesn't get driven at 2500+ rpm ever, it frequently does, but for around town driving I keep it pretty low in an effort to improve fuel economy.
My car averages 27-28mpg with mixed, but more highway than city, driving.
Any other consequences of my shifting technique? Thanks.
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