Outlander PHEV Towing - new record for mpg?

Managed to get the MPG down to 24.9MPG, doing 60 miles of towing started off with no battery, part of my towing test to see what happens prior to going to France for holiday, gave me a range on a full tank of 160 miles.

Given journey to South of France is about 450 miles hope the average MPG increases otherwise will be doing a few fill ups along the way...