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Trying to be positive about it, even down in Portugal the ambient temperature will have dropped a bit over the last few months, which will affect the fuel consumption, more so on short journeys. A colder engine uses more fuel. And winter diesel is different too - but I have NO idea if you get that, probably not, but I don't know if you're North or South and ever see freezing conditions. Just my opinion, but if it runs well without excess smoke, starts fine, and no problems at any running conditions then it's not over likely to have damaged injectors. Of course you may have had it years, I don't know that level of detail, and the fuel use has not been this low before at this time of year. But if you have had it a while have you always filled the tank? If not then there's no comparison to be had sadly. And at 2 to 3 mpg worse yes it's costing you money, but at low miles per year (guessing again here because of the 10km journey, but you could do it many times a day.....) then that actual cost may not be that high? And it's relative cost compared to a set of refurbished or new injectors?

Did you replace the o-ring when the injector was out?