BY JIM BIGLEY
DECISIONS, DECISIONS…
Hello. We have a 2018 Z71 Silverado equipped with a 5.3L gas engine, crew cab, 4×4, a sixspeed automatic transmission, and a 3.42 axle ratio. Recently, the truck produced 6.7 mpg here in Oklahoma while towing our fully loaded, 7200-lb travel trailer. I would like to improve towing fuel economy and not have such a busy shifting transmission. We typically tow at about 65-to-70 mph.