i think you should be getting better than 16 mpg in florida even when its winter. currently im getting 19.5 mpg almost consistently w/ half city driving and half highway driving. on straight highway i get about 24.5 mpg. i have 33's and 4.88 gears. i also have a carb.

87 22R PU, 2? body lift, 33? BFG muds, 4.88's, F&R Lock-Rights, Rancho Shocks, EB's Street RV Head w/ 268 Cam, LCE Header, 2" to 2 1/4" exhaust, Flowmaster 50 series, Magnaflow high flow cat, complete Herculined SR5 interior, V6 BB, MC, and calipers.