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Divide and conquer

I drive a 1984 Ford Meteor and have recently switched to PULP with a lubricant additive. I find I'm getting better fuel economy and performance, but I am not sure how much additive I should be using. The instructions indicate what I should be using per tankful, but I rarely fill up. I'm putting in 20-25ml every second refuel (about 15 litres per refill). Is that about what I should be putting in to ensure my engine will suffer no damage?

You can work it out simply by calculating the amount of additive you need to add per litre of fuel. The instructions on the packaging will tell you how much to add per tankful, and you know how many litres your tank holds (if not check your owner's manual, which will contain the capacity of the tank), so divide the amount of additive by the tank capacity in litres and then multiply that by the number of litres you usually buy. Add that amount and you should be OK. Add a little more for safety if you like.

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