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Please clarify: "cooled volume versus total fridge volume ratio is quite poor."?
The cooled volume is the cavity that you put your beer and non-essentials.
The total fridge volume is the outside case envelope - i.e. how much volume the entire fridge takes within the vehicle including space for the radiator cooling.
Since the compressor volume + radiator cooling volume is very similar for the larger or smaller fridge, that overhead volume is a larger percentage of the total volume for a smaller fridge than a larger one. That's what I mean by the volume ratio. Basically a packing efficiency.
It's the engineer in me disliking inefficiency. But like I wrote, in the end the fridge has to fit into the space you have available for it in the vehicle...
I own a smaller (capacity Engel) and a 50qt ARB and even though the ARB has nearly 3x the beer volume it really isn't much 'bigger' than the Engel.
cheers,
george.