I'm going to MDW, this weekend, for the weekend.
Atlantic Aviation is :( $6.23 per gallon. MillionAir is $5.34, and Signature is $5.76. I'm going to Atlantic, because after you factor in parking fees ( both with and without, the required minimum fuel purchase), it's cheaper to go to Atlantic.

(millionair want's $80/night, no fuel, and $40 with fuel purchase)