After 21 days of driving in January, here is the result.
Period drivenJanuary 1 to January 31
Gross Earning (according to Grab statement)Dec 31 to Jan 6 = RM749.05
Jan 7 to Jan 13 = RM783.55
Jan 14 to Jan 20 = RM779.80
Jan 21 to Jan 27 = RM551.86
Jan 28 to Feb 3 = RM729.10
Total = RM3,593.36
Commission paid to GrabDec 31 to Jan 6 = RM140.40
Jan 7 to Jan 13 = RM148.80
Jan 14 to Jan 20 = RM145.65
Jan 21 to Jan 27 = RM106.20
Jan 28 to Feb 3 = RM140.20
Total = RM681.25
Petrol paidDec 31 to Jan 6 = RM145.71
Jan 7 to Jan 13 = RM94.92
Jan 14 to Jan 20 = RM86.49
Jan 21 to Jan 27 = RM96.86
Jan 28 to Feb 3 = RM166.37
Total = RM590.35
T&G top upDec 31 to Jan 6 =
Jan 7 to Jan 13 = RM100.00
Jan 14 to Jan 20 =
Jan 21 to Jan 27 =
Jan 28 to Feb 3 = RM150.00
Total = RM250.00
MiscCar tint = RM200.00
Radio fix = RM60.00
Total RM 260.00
PnLGross earning (RM3,593.36) - Costs (RM1,781.60) = RM1,811.76 (50.42%)
From there, deduct RM1k as emergency saving, then the rest are to spend on food
Not going to drive February at all because of planned vacation to Hanoi

so yeah, based on this, I think driving Grab full time is reasonable if you don't have loan commitments, isn't looking to get rich quick, and value flexibility of time.
I did achieve the main goal of driving Grab instead of full time employment, which is spending more quality time with wife. There are still some concerns about doing this for the next couple years, but we'll decide after Grab announce the PSV thing, as in how they will go about it
Currently the decision is resume driving Grab full time in March after done with vacation
