Do this and save this. 2 answers. Do what and save what?

Circular gauge with a red needle pointing toward the red danger zone on a color-coded red-to-green scale
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Answer: Drive the speed limit; save gas money

Clues: “Decelerate” and “Cheddar”

A new study by the University of Minnesota reveals that driving the speed limit saves million$ in gas. Researchers studied 120 million trips. They found 43% of trips involved speeding and that drivers spent 12% of the time above the limit. They crunched numbers and say staying at the limit could save $22 million in fuel each day.

Driving the speed limit cuts millions in fuel costs for less than a minute of your time | College | College of Science and Engineering