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*To*: quattro@coimbra.ans.net*Subject*: Re: DRLs*From*: John Hobson <johnh@haht.com>*Date*: Sat, 11 Jan 1997 14:21:02 -0500*Sender*: owner-quattro@coimbra.ans.net

>> I have to agree. I can't believe that ANY lights would have a measurable >> impact on mileage. Even A/C is far less than a 10% drag... Since an >> alternator is being belt driven all the time anyway (unlike a clutch >> operated A/C unit), how would the mechanics of lower mileage come into >> play ? The greater the electrical load on the alternator, the harder it is to turn the alternator. For example, a hand-crank generator would turn freely with no load. But if the generator is under load (say powering a set of lights), then the generator will be harder to turn. DRLs should not drop mileage by 10%. It should possible to estimate the drop in mileage. Use the wattage of the DRLs to determine how many kilowatts per hour the DRLs are using. Convert the energy in a gallon of gasoline to kilowatt hours. Now divide the kilowatt-hours DRLs use by the number of kilowatts in a gallon of gasoline and multiply by 3 (if you assume that an internal combustion engine is 33% efficient) to get the amount of gasoline used per hour by DRLs.

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