The simple answer is yes it saves money and gas driving at a lower speed. Here is a brief explanation as to why.
In a typical family sedan, every 10 miles per hour you drive over 60 is like the price of gasoline going up about 54 cents a gallon. That figure will be even higher for less...
...truck in the street? and take a chance on it getting pelted with hail or should I leave it in the driveway and take a chance on a limb from the big tree over it smashing into it. All I have is liability insurance. Thanks