MPG Nosedive

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 at 51K

The tyres are good and tracking is ok. im not carrying extra weight in the boot

i cant think of anything else to check, any ideas?

i have recently had a new oil sump plus battery installed (bad battery) plus a new exhaust (center pipe and back box due to corrosion)
 
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