many things can a transmission on its way out is a big one a clutch slipping anything
because you run them to hard and it causes wear and tear. Specialy when you drive alot at high rpms it causes metal to metal.
no
trash in carb or muffler stopping up.
probably the jetting, but it could be many other things.
Yes but it runs hotter on high grade which produces more rpms
either the throttle position sensor (TPS), or a vaccum leak
lower rpms use less gas higher rpms have more power
its either the throttle position sensor or the map sensor.
Poor driving habits, poor air intake, improperly adjusted fuel pump, excess operating RPMs.
My KIA Sephia is doing the same thing. I was told that my valve body was stuck and needed to be cleaned.
it could be a range of things. it could be overheating, gas gauge is low, or your rpms are running too high.
major vacuum leak?