I complained about the mpg at the last service. They said there was a software update. Mpg went from 27mpg to over 40mpg. I hope this may help any owners suffering from this issue.
You sure it's not just an update to the trip computer, which may just have been incorrectly calculating the mpg?
An engine remap of sorts from a software update might give a few percentage points increase in mpg (say 2-3 tops, but probably less [they tend to do such things to reduce emissions]) at best but nearly a 100% increase? I seriously doubt that. The auto version of that car is well-known for its poor mpg, the manual average at best.
Try using the 'brim-to-brim' method to calulate actual mpg over several fill-ups to see what the figure really is.
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