How so? My 06 GMC weighed 5200 pounds with a 5.3 HO engine, auto, 4wd and got 16-18 around town and up to 22 on my trip to WV. My 18 Tacoma 4wd V6 auto gets 14 around town and can barely top 22 if I stay out of cruise control on my WV trip. Oh, it also weighs 1100 pounds less than my GMC and...