I read part of a study today that was prepared by a University, but it was only done on a commercial fridge and it showed between 4.9% and 6.3% reduction, but will that translate into a real world saving?
I can get the report and flick it to you if you like Symon.
Most of the "testimonials" are showing around a 15% reduction, I am very sceptical, but without actually knowing anything I don't know what questions to ask, or what answers I should expect to get back.