I know there are several threads about fuel consumption but maybe it could be done slightly differently..
Whats your ed 30 fuel consumption indicated at a steady 50 and 60 mph in 6th gear.
After zeroing at the required speed, mines an indicated 34 ish and 31 mpg respectively using cruise control. I think that seems to be poor tbh even though mine may be mapped. Speed for speed and on a steady throttle mapped/unmapped should be similair I'd have thought.