Fuel Efficiency

Over the past few weeks I've been measuring the fuel efficiency of the Fatmobile. The reason for this, apart from my usual scientific interest and mild obsession with statistics, is that I wanted to see if using the fuel additive Redex had any real effect.

I usually fuel up once a week when I do my shopping. Asda is about the cheapest, usually a few pence per litre cheaper than the next. I always replace, as best I can, the amount used, so I have a rough approximation of how much has been used and I record the number of miles since I last filled up. It's not a precise method, but not too bad.

Miles	Litres	m/g	l/100km
280	27.46	46.35	6.09
318	28.8	50.20	5.63
276	25.4	49.40	5.72
317	29.21	49.34	5.73
435	40.13	49.28	5.73
258	24.04	48.79	5.79
368	33.51	49.92	5.66
365	34.59	47.97	5.89
329	31.94	46.83	6.03

I've high-lighted the times I've used Redex in grey. I'm going to continue measuring to see what effect prolonged use has, but you can see that it does seem to have some effect.