Fuel savers

Mac Format - - APPLE TALK -

I have been track­ing my var­i­ous cars’ fuel econ­omy for 15 plus years now, us­ing Ex­cel. About six months ago I de­cided to go Mac and now have an iMac. I need as much help as I can get so I am a sub­scriber to your mag­a­zine. I have two points to make about your ar­ti­cle.

Firstly, I keep a notebook in the car for log­ging fuel pur­chases and mileage at the time of pur­chase, and I al­ways fill up to the max­i­mum when to pump clicks. If I have to fill up in an ‘emer­gency’, I just put in, say, a nice amount such as 10 litres, which doesn’t go onto the spread­sheet – it gets added to the next full fill-up.

Se­condly, in the spread­sheet I ‘smooth’ the miles-per-gallon fig­ures us­ing a ‘Run­ning Mean Smooth’. One can choose the num­ber of con­sec­u­tive val­ues to use their mean; I use four. So, the ‘cur­rent’ value on the chart is the mean of the last four fig­ures. It makes trends eas­ier to spot. I plot both raw and smoothed MPG val­ues. Henry Chan­dler Alex Blake says… There are a few dif­fer­ent ways to cal­cu­late your car’s fuel con­sump­tion, as you have rightly pointed out. The way in which you work it out de­pends on how strin­gent you want to be; whether you want to watch the pen­nies with an ex­act fig­ure or get a more gen­eral idea of how much of a gas-guz­zler your ve­hi­cle is. We just tried to keep it fairly straight­for­ward this time!

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