Yea don't use the tank capacity, 4.755(4.8) gallons, for your base calculation,, if you read what you wrote in words, you just said you get 187miles for every 4.8 gallons, or a full tank. But the truth is you get 187 miles til you hit empty, the amount of gas you put in at the gas station is how much gas 187 miles consumed. So if you had to put in 3.5 gallons after driving 187 miles you final calculation would read. 187.5/3.5= 53.6mpg
When the needle reads empty there could be anywhere from .5 to almost 2 gallons left in the tank, depending on how much your gas guage sucks
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