mine round town on the aggressive map sees about 22-23mpg on the economy map it's 25-26mpg.
right footing it everywhere makes it go down to 18 though.
never seen more than an average of 30mpg on a motorway run at 70-75mph though, the split in intake hose may have an effect on this as it won't be metering correctly and running too lean.
a remap is well worth it though, really sharpens up throttle response and gives a little more economy back, at a price though, but with mine i can change between more response and power with the more economical one that is better than factory in response.