Can't buy much imported goods
Heck even local produce is yahudi price in Msia

Inflation control is epic fail in MY.
Likely -1k for rental and transport
Then food 600 (20 per day cover 3 meals)
Misc few hundreds cover MY side bills?
Rest is savings

Seriously the purchasing power is awesome la..
$900 gets u very nice Thinkpad selection in preloved market
like T480 all maxed out with 32GB RAM, i7 8650, 1TB SSD
or X1C 6th gen
Its about AM salary range here for 5.5k
In few months easily collect money..
saving money in SG is very doable because food is so cheap here, assuming you don't blow it on ciggies or drinking.
Healthy lifestyle need not be expensive..

Excluding expensive eateries in malls (food court only $6.50 or so for wa tan hor)
but if wanna hv very filling high protein meal hawker food (with upsized meat) only $6.50-7.50 thereabouts, chicken rice, briyani mutton
or sliced fish noodles only $5

these are not the nonsense nasi tulang RM5 in PJ not even fit for prisoners

Rm9k. It just goes further. I don't get why people say sgd5.5k is better spending power, when in Malaysia people buy car and rent whole unit and say it's not much leftover. Meanwhile in Singapore they rent a room and take public transport. It's simply not comparable when you are living different lifestyles.

Exactly, I don't understand why so many people are stuck in the 3x mindset.

For SGD 50, one can only get 15.33L of RON 95 in Singapore. For RM 50, we get 24.39L of RON 95 in Malaysia. And, interestingly, I have not seen RON 92 for decades. But, it is still available in Singapore.

I studied my degree in Singapore and returned to Malaysia long long time ago. Never regret.

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This is not all of it 
Earned 8K in KL prior to coming over, can't even dispose|save this kind of money - eating out in KL just kaching kaching too much

I am sinkie. A new sinkie.

That's the problem. And yet there's literally no better job to enhance my earnings locally - believe me, I tried  but the general consensus was appalling (hard to get iv for any 5-figure Telco Prod Dev/Prod Owner job in KL ). It got to the point that I thought whatever I was doing all along was moot and useless field, and I gotta accept it is what it is, forever poor life. Yes there are PD/PO job for banking/insurance but not my forte.

But kiasuland telco can readily offer (sealed the deal in ten days from first iv).
Ironically for a tiny country there are more job opportunities related to what I do [even considering the competitors].
And for the first time of my life I can actually afford toys like a good laptop or new iphone

What i am trying to tell you is if money is your motivation then becoming an employee in malaysia is the wrong option. You want money in malaysia you have to do business. Its very easy to reach rm1m of revenue in malaysia compared to SGD1m in singapore. Similarly Singapore is better if you are an employee. Conversely doing business is going to be tough in singapore due to competition, tight labour market and crazy rentals. You need to see which one fits then go for it. Like putting square pegs into square holes. No point trying to force square pegs into triangle holes. Its not gonna work.