This means the actual fuel consumption of the truck is between 21.6 gal and 23.4 gal.
Recording the daily fuel consumption for a month (30 days), the driver would have recorded a total fuel usage of approximately 675 gal to 702 gal.
A delivery driver estimate his truck use an advage of 22.5 gal of fuel the estimate is within 4% of the actual girl the driver record eatch day for a month
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