With my Ultra-gauge and driving style 'adjustment' I've upped my FE from 36mpg to 44mpg, 19 % increase! Might not be world breaking but it's a start
Next target is 50mpg
Will start with a service - synthetic oil, k+n air filter and plugs. Adjust tire pressures and continue to improve my driving!
Thinking also of putting in a Torque Lock status LED so see how effective the slushbox is at locking?
As other has noted this is additive
Paul