needs to shift on 2007 Chevrolet Silverado 2500 HD

does anyone else have the feeling that their truck could use another gear mine is always holding back as soon as i let off the gas it slows down right away it doesnt coast at all my foot is always on the gas i only get 10 to 13 miles per gallon i got that much when i had mt 2500 avalanche with i think it was an 8.1 litre this is ridiculous that they would both get the same

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2 answers
is it shifting 3times
It could be that your torque converter is never engaging. Definitely would be worth checking into, as your concerns do seem abnormal.