imho you can get 33 but at 75 that might be pushing it, in winter that will obviously drop.
speed time mpg cost/day cost/year
55 MPH 120 min. 34.0 $11.32 $4,131.80
60 MPH 110 min. 33.0 $11.67 $4,259.55
65 MPH 102 min. 31.3 $12.30 $4,489.50
70 MPH 94 min. 28.2 $13.65 $4,982.25
75 MPH 88 min. 26.2 $14.69 $5,361.85
80 MPH 83 min. 24.5 $15.71 $5,734.15
http://www.mpgforspeed.com/
how do you feel about a honda fit