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[Fuel-saving action] Drive at moderate speeds [More information] To save gas, stay at or under the speed limit, and drive at a consistent rate of speed. Use cruise control on long trips. [Reason] 
Traveling at 55 mph can give you up to 21% better mileage when compared to 65 and 70 mph.
10 Driving Tips For Saving Gas – Repairs Learning Center – State Farm
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