My st (standard) returns at best 20-22 mpg over the last 4 1/2 month, boot it and that drops to about 15-18 mpg!

Maybe a re-map might help but at best thats only going to give about 3mpg more and thats being generouse.

I knew when i bought my st petrol and mpg would be an issue, if this is the case for yourself then dont buy one.

(edited cos i went out and checked the mpg)