I’ve had my
Mk3 Leon Cupra for 7 days now and have a 50mile daily commute, mainly motorway, plus a 130 mile trip home after picking it up. I filled the tank after leaving the
dealer and filled up this morning. I’ve hit 43mpg on a trip home driving at 70 in comfort with the factory settings. I thought that was pretty good....? Car has no mods at all. If yours is excessively heavy on fuel look at dyno/mapping session maybe..? May
help to see if anything untoward is going on or just map in any mods you have to get them running better together. Just a suggestion