Low mileage isn't really the problem it's down to low revs. I drive a truck and you wouldn't believe how much difference it can make if you have 2 identical trucks but one's been used on say supermarket work which isn't full weight and they stick at 50 and never rev high, compare that to the other that may cruise at the same speed but at full weight where you have to use the revs. if you then put the supermarket one on full weight work its so under powered and naff on fuel for the first couple of weeks because of all the carbon built up over time. You need to use the revs occasionally to keep the engine clean and I try not to use supermarket fuels. The base fuel is the same everywhere but they add different additives as they deliver the fuels to the spec of each company.
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