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Over the weekend I rented a GMC Sierra long bed with cylinder deactivation from U-Haul. With the cruise control set to 55, driving through mountains with 32PSI in the tires and an outside air temperature of 20F, I averaged 27.5mpg over 180 miles. On the way back, with cargo in the bed, I averaged 21.5mpg.
I could see 30's easily in that truck when the weather is warm and more air in the tires. My only criticism - it was able to climb relatively steep inclines in top gear without dropping out of cylinder deactivation, nevermind downshifting, suggesting it could have had a significantly taller final gear.
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