I get 28-30 mpg letting the revs build to 4k rpm with the throttle just over halfway. I do the speed limit on the highway most of the time. I have too much fun in my car and still get better fuel economy than anything I've owned before
shifting at 3-5 k, I didn't really noticed a difference on consumption on a 4 banger, regardless I atleat get 25+ mpg.However, on my v8 I loose alot of gas, wether I drive it slow or fast. When it comes to gas consumption, its a win-win situation for a miata.
I get 20 mpg city driving and about 27-30 highway. So usually maybe a little more if I really let the needle drop below the last mark 225 miles per tank city driving and 280-320 highway per tank. Turbo