Why does the MPG returned by my car go up significantly after a long motoway run?
It's noticeably up on what we usually get for the same journeys, 45 mpg is now 53 mpg. The only difference being the fact I've done 800 motorway miles last week.
Does this mean the car is getting clogged up on my usual drives? Is the fuel I'm using partly to blame? Do engines change the fuelling/timing/boost based on what the car does over the last few hundred miles?
What is the best way to keep the car in this super economical mode?
It's noticeably up on what we usually get for the same journeys, 45 mpg is now 53 mpg. The only difference being the fact I've done 800 motorway miles last week.
Does this mean the car is getting clogged up on my usual drives? Is the fuel I'm using partly to blame? Do engines change the fuelling/timing/boost based on what the car does over the last few hundred miles?
What is the best way to keep the car in this super economical mode?