The answer is 14.44. This is actually a basic question for me to answer to you. All you have to do is to subtract the decimal in its right place and add a zero at the end.
14.44 gallons
To find out how much fuel was left, you need to find the difference between how much he starts with and how much he ends with. So, the equation would be 16.14 - 1.7 = 14.44
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