Say i am driving along in top gear and have to reduce speed. I haven’t slowed down too much so i can stay in top gear if i want but will need give it more throttle to prevent the car from stalling. Alternatively i could drop a cog and therefore not have to give it as much throttle.
But which is best for the car, both in terms of engine load and fuel economy? I mean, one makes for lower revs but opening the throttle more fires more fuel into the mix yes? On the other hand i can have more revs but less throttle so less fuel being pushed through? Also, i would normally associate higher revs with more engine wear but in the ‘stay in top gear’ scenario the engine sounds like its struggling a bit so does this cause more engine wear than changing down?
Higher revs = more fuel being burned or more throttle = more fuel? Which is it? Am i being really stupid here?