I tried to make use of the expressway as much as possible and
here are the failed routes just for your reading. 
By airport:
36 from opp Blk 57 to airport – 20 mins
27 to Blk 938 Tamp – 10 mins
15/23 from Blk 141 (just opp) – 5 mins
add in the waiting times and it takes 50 mins.. def fail

By PIE (Eunos):
To Still Rd – 5 mins
969 from Still Rd to Kallang Basin – 12 mins
Crossing opposite + waiting time – 9 mins
23 from Aft Infineon to Opp TP – 10 mins
roughly takes 35 mins.. rather take 15 and save all this hassle
:lol2:
might as well take 15 and sleep all the way.. lol..
For Tampines IMO 15 and 31 takes around the same time. If Eunos
area is jammed too much then 31 is better..
To Harbourfront and anywhere along the south-western coastal
line its good to take 31/16 to Old Airport transfer to 10/30. 10 or
30 makes no diff during off peak cos the waiting time for 30 can
kill you. Alternatively 196 to shenton way xfer 10/97/57/131 to
harbourfront
Anywhere mid-west (bnv clementi and probably jurong east) take
48 to
i) Holland Rd xfer 7/106/165 for Clementi bound (xfer 52/99/105 to
go jurong east)
ii) Holland Ave xfer 106 to go SP
iii) Farrer rd xfer 93/153/855/961 for anywhere along the Queensway
corridor. Bt merah corridor just take 196.
Northern areas like Serangoon Paya Lebar Aljunied Macpherson
Estate and Ang Mo Kio just take 43/76/135. Toa Payoh take 966
Far North East and North has been mentioned liao...