[cojaro]

                    FitSport       Civic
horsepower     |    109@5800      140@6300
CARB rating    |     LEV-2         ULEV-2
turn diameter  |     34.4          35.4
brakes(in)     |    10.3/7.9      10.3/7.9
wheels         |   15" alloy     16" steelies
length         |    157.4"        174.8"
height         |     60.0"         53.5"
width          |     66.2"         68.9"
weight(MT/AT)  |    2471/2551     2657/2718
weight distrib |     62/38         60/40
headroom(f/r)  |    40.6/38.6     38.0/35.1
legroom(f/r)   |    41.9/33.7     42.6/30.3
shoulderroom   |    52.8/50.6     53.9/52.1
hip room       |    51.2/51.0     53.0/49.2
cargo space    |    21.3/41.9       11.5
(seats up/down in cu.ft.)
EPA MPG        |      28/34         26/34
realworld MPG  |      33-35         37-30
sec.system     |     standard      standard
with remote    |
fog lights     |     standard      optional
power windows  |     standard      standard
power locks    |     standard      standard
cruise control |     standard      standard
stereo         |    200W/6spkr    160W/6spkr
aux. input     |     standard      standard

(see: MT Fuel Economy Poll and DX/LX/EX: Your Gas Mileage - 8th Generation Honda Civic Forum )

It's all up to you and what you want. Here, we're going to suggest the Fit, naturally.

If it helps any, I traded my '06 Civic EX in for an '07 Fit Sport and I'm consistently getting 32+mpg (got an average of 27mpg in the Civic).