No, not Goodman Gray... His evil twin, Grossman Gray.

Well, that's not exactly what my issue with this is.

I am not convinced that there is really such a thing as "lust energy" in the Dresdenverse. I think the White Court Vampires use emotions* to access life force from a person/being. Not that the emotion itself is the energy.

Similarly with Sells, or Harry using his rage in a spell. When Harry does that it still draws on his own energy... Harry almost kills himself in GP with an anger fueled spell ("Pyrofuego") because he just about used up all his own life force.

The lust bit is not as central as it seems, Raith are not absolutely locked into feeding on just one emotion. (Madrigal Raith can use fear, from WN.) There's a WOJ that the Houses feeding on specific emotions is as much cultural/political as anything.

But I think you need life capable of emotions. I really doubt that Lara or Thomas could feed on, say, Sells' lake house.

See I'm not sure this is the right model (different kinds of stored energies).

I think the magical energy is just magical energy, all the same kind. The different items just use it in different ways. It's the same thing as how a computer and air conditioner and microwave and lightbulb all run on electricity, IMO.

Sure, but we've seen storage of energy retain the traits of the origin, like the sunlight in the hanky and the kinetic energy and any other spell or or potion Harry has made.  If the vessel were designed to store spirit energy in the form it was gathered, wouldn't it remain consumable?

Cristos (Christos) means "anointed" in Greek.  Gregorio means "watchful". So the translation would be "Watchful Anointed".  Probably an assumed name to invoke the idea of leadership and worthiness. More so than his birth name, which was Cowly McCowlface. 

Something like that. Any mechanism that prevents the tank filling up in a manner that would make it better to just feed more than it would have an external reservoir. I'm not saying that's the case. I'm saying it's an additional practical concern regarding the feasibility of making a gas can.
Sure, but not by me. A thought occurs to me that the difference between one wamp and another might be about fuel efficiency instead of the tank's capacity. Both is more likely than either/or.

I think it works either way. 

We know that the "Hunger" of Wamps is variable, and how Lord Raith established dominance.  I don't think we know the exact nature of that, because we're used to thinking of hunger as a state rather than a force. 

Maybe the "Hunger" is equivalent to allure, and his ability to overwhelm the senses of others is his only advantage.  Maybe there's no top to the tank, and it can be infinite storage for any wamp.

But clearly it doesn't work that way, seeing how often Wamps run out.  Thomas has been drained numerous times, Lara's sisters needed immediate feeding after the battle with the Naagloshi, and Lara was spent after feeding Thomas.

Wamps just don't seem to have the ability to sustain their power without constant feeding.  Except for Lord Raith, who managed it for almost thirty years.

So I'd still argue that them having a snack pack in reserve would be valuable.

It's basic banking. You can keep all your money in your debit account, but if you do that, you might find yourself overdrafting due to poor budgeting and an untimely expense.

Putting some money into savings as you go might mean a little less to spend along the way, but over time you get used to the budget, and then if something happens, you've got a reserve to draw from.

The argument being touted elsewhere is that Lara was weak and drained at the end of PT because her tank was empty because her tank isn't as big as Thomas's.

Otherwise there's not much explanation for her empty tank when she'd had an orgy and fed off a guard all within hours of feeding Thomas.  The only suitable explanation at that point would be that there's nearly 100% energy loss in their feedin nursing method.

Originally they may have been middle class. You seemed to have never lived in a shotgun house, which are quite common, at least in Louisville although they are found in Chicago.  The house may be no wider then 12 feet, with setbacks that would make the lots about 17 feet wide. I lived in houses which were separated by no more than than the walk that ran between the houses.  Variations on a theme, camel back, three or four  rooms down and one up.

A regulation basketball court is 94 feet long and 50 feet wide. Look at 3552 Winchester Ave in Chicago on street view, this is how I picture Harry's house.

Doesn't look like a traditional wood boarding house.

There's also the question of can WCVs fill their tanks. If they can't fill their tanks, they don't need a gas can.

What do you mean?  I think the item would be the source of the power and the wamp would feed from it. It wouldn't give the host the power for the demon to then feed from.  That probably wouldn't be healthy.