Not sure about the Chine Yuan since boxofficemojo has yet to update that part, but regarding the GBP and AU dolalrs, they were both HEAVILY in favor of Avatar, you can check boxofficemojo if you would like for that info, just go to Avatar/TFA in the foreign section choose which country you would like and select local currency, it will then show it's worth agaist the dollar for said period (you must select a date as well). Avatar had a HUGE advantage with the currency exchange rate compared to TFA, if they were tied, the results would be MUCH closer.

It's already lost about 50% of its potential foreign total to exchange rates, which is fast-approaching a shortfall of 500MM.

I checked the historical value of those currencies vs. the US dollar at the time Avatar released and now. I didn't do it on boxofficemojo so my guess is that boxofficemojo is wrong. 

In Brazil for example when Avatar released the Dolar was worth +/- 2 Reais. Avatar is the bigest box office in Brazil history with 60M dolars made +/-. Now with FA the dolar is worth +/- 4 reais, and FA still managed 25M dolars so far, that wouldve been 50M on Avatars day. So for FA to make more money than Avatar it needs to be seen twice as much, the fact it still managed 25M with this crap currency exchange rate is a phenomenal achievement.

Thats just 1 country but pretty much all of Europe and the rest of the Americas also have hugely disfavorable exchange rates in comparission to Avatar. The Euro was almost 1.43 dolas on Avatar release thas a gigantic difference from what it is now (its close to 1.09 dolars now). 

If box office mojo is wrong than Avatar numbers are wrong and it made less than 2.7 billions WW since Mojo has the official numbers for what the movie made on each country in local currency and than just converts it to dolar. Its obviously not wrong.

And I checked historical rates as you said just to be sure, on 2009 during Avatar release 1 Australian dolar was worth 0.84 US dolars, on december of 2015 (FA release) 1 Autralian dolar was worth  0.73 dolars, so adavatge for Avatar. And the British pund was 1.65 dolars each in August 2009 and 1.49 dolars each on December 2015, yet again favorable to Avatar. The Yuan is very very slightly favorable to FA (0.146 for Avatar x 0.153 for FA) that barely even make a difference, FA would gross as much as Avatar with like 95.4% of its tickets sales.

Looking at these exchange rates closer like Im doing now, since your post brought it to my atention FA realy has to sell way more tickets than Avatar to make up for the hughely disfavorable exchange rates WW, maybe even around the 1.3-1.4x more tickets mark. If doing the completly nonsensical ludicrous thing of considering that a movie that sold like 100 million tickets 70 years ago would sell the same amount nowadays and just adjust to inflation to see how much money itdve made is a thing, adjusting exchnage rates to match the ones more favorable to a certain movie should be a thing to lol.

Where did you check? 

I checked mine here http://www.x-rates.com/average/?from=EUR&to=USD&amount=1&year=2015 and I satetd what I found at the post above yours. I cant guarantee this is acurate but it does align to what Mojo has, so kinda unlikely that it isnt since we have the same numbers from 2 different sources (and for the Brazilian Real wich is the country I live in its spot on, so if it got that one right Im asuming it got the rest as well).

I was wrong. Of the big market, only China is favourable to Avatar. So, the only way to have a somewhat fair comparison is to compare values in local currency. In Australia, TFA is at AU$79M after 4 week-ends. Avatar ended at AU$114M which means TFA will not pass Avatar. And that's despite the rise in ticket price.

It remains to be seen if TFA can sell more tickets than Avatar in the US.

The Force Awakens marketing budget isn't even that large:

http://fortune.com/2015/12/08/star-wars-marketing/

Yes sure it has a lot of promotional tie-ins, but so does every Star Wars movie. The prequels had a larger cross-marketing deal with Pepsi that was a whopping $2 billion and encompassed not only all Pepsi brands but restaurants like Taco Bell, KFC, etc. too. 

The main marketing for this film was really the critical reception, once word of mouth started to spread that this was better than the prequels and a return to the style of the OT, that is what brought in the general market, who I think by and large enjoyed the film a lot. 

This is a franchise that just a few years ago seemed to be kinda be out of gas. I remember the Phantom Menace 3D re-release which didn't do that great on top of the Clone Wars theaterical movie that just straight up bombed. More than a few people even thought $4 billion was too high of a price that Disney paid. 

UPDATED OP WITH WEEKEND ACTUALS.

Not sure where you saw it or how you so it but you might be doing/looking at it wrong, since you need to check USD vs EU 2009/10 vs 2015/16 and with other currencies as well, you can't just compare the dollar with itself, and trust me in 2009/10 compared to now, the USD was much weaker compared to the foreign currencies, I should know, I lived in EU from 2005-2013.