I picked up my zx4 base in august. 2.0 pzev with an auto trans, <10k on the odo. Highway driving I get between 30-33 which seems about right I suppose. However, city driving makes my mileage plummet to 20 mpg. I drive like grandma and it still sucks gas down. I'm in a flat city (Phila) so that's not it. My old saab with bosch CIS got better mileage than this car, and this one weighs almost half what the saab did. WTF