I'm not denying your right to heat your house with Oilas I do and I'm not out in the wilds.... You probably use Kerosine - and that's of no interest to C&E
AeSmith, MGO is Marked Gas Oil= Diesel which is the same (ish) as whatever you put in your boat and possibly your car if you're naughty. So C&E is interested in monitoring your domestic heating oil consumption (if it's Gas Oil)
Both - Domestic heating oil comes in two varieties:-
28Sec = Kerosine This variety is used by the majority of peeps who need to heat their houses with "oil". My suppliedr calls it "Premium Burning Oil"; the only thing premium about it is it's current price...
35Sec = MGO = GO = Diesel. This is only for peeps with a very large house to heat, for all sorts of reasons.
Both are known as "heating oil" - hence the general confusion.
The xxSec is a measure of its viscosity, ie. how long it takes a sample to pass through a standard measuring funnel.