my 09 k12 micra (its an auto) MPG has taken a nosedive from about 45ish to 25 mpg (ive stuck in £70 of fuel in 3 days and probably drove less than 100 miles)
theres no leaks and the fuelcap is locked
last service was at 65K miles (oil and filter) im now on 80K miles
The last big service was...