how much miles per gal should i get from my honda accord 2000 2.3L 4 cylinder? and is it economical?

yes,it is economical,you should be getting around 18 to 23 city and 26 to 30 highway i would think,but a lot depends on driving habits,city driving stop and go lead foot or not.

EPA estimates 20 city/28 highway, according to their website: http://www.fueleconomy.gov/feg/noframes/15904.shtml This is still very economical by auto standards, for example, I just bought a 2008 Dodge Caliber, 2.0L engine, auto transmission, which is rated at 23/27.