Does a car run more efficiently if it is used more often?
I bought a second hand car recently. It had been a second car for the previous owner and they didn’t use it very often. It has very low milage for its age. I filled up with diesel and reset the miles per gallon counter. I then drove to work and back on my normal 50 mile round trip until the diesel got low (about 2 weeks). At this point my mpg was 48. Filled up, reset counter. This time I got 50mpg. Subsequently it seems to have settled at about 51 mpg. Has driving my car regularly and on the motorway been good for it? Made it more efficient? How?
This question is in the General Section. Responses must be helpful and on-topic.