1500s are also a big step in efficiency, for someone that actually utilizes a truck, a capable 1500 vs a 2500 is as big of a step as going from that 1500 to a car
(my examples are limited as most 2500 trucks aren't rated)
2005 2500 silverado 2wd 6.0L auto comb mpg 11 or 9.1g/100mi
2005 1500 silverado 2wd 6.0L auto comb mpg 15 or 6.7g/100mi
2005 1500 silverado 2wd 5.3L auto comb mpg 16 or 6.2g/100mi
2005 cobalt 2.2L auto comb mpg 24 or 4.2 g/100mi
2005 aveo 1.6L auto comb mpg 26 or 3.8g/100mi
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