| There are different ways to use less gas while driving. I just found this on another forum I frequent: The photons from the headlights slow the time down as the car travels through the path of the photons traveling at the speed of the light. Therefore, the velocity of the car has to be recalculated accordingly. Because less time is spent to travel the same distance, the speedometer reading is slower than it is. miles/gal = miles/hour x time spent x 1/fuel used.
Therefore, as the speed goes up miles/gal improves. So you get better mpg with the headlights on. Here is what Einstein thinks about it:
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In light of rising gas prices ... - 
