Folks,
Got back early Monday morning from my Mayuram trip. Thanks for all the help on the routes. Thought I would just give a quick update.
We started around 10 am on 24th from Bangalore. Being a holiday I was able to reach the Attibele toll booth pretty quickly. We did take the elevated road since we had started late. Of course we waited at the Attibele booth for almost 20 minutes. (This was peanuts compared to my return trip - read on). We drove non-stop till Namakkal. The diversions till Krishnagiri were manageable in the day time. The drive from Salem was peaceful - I could do good speeds. We sort of slowed down near Namakkal looking for a decent place to eat, but couldn't find any. (Any suggestions on places to eat near Salem close to the highway for our future trips?) Reached Namakkal around 1.45/2 pm.
Upto Namakkal/Trichy:
We ate at Hotel Nala's in Namakkal which is on the RHS on the way to Trichy. Okay food, very spicy. I felt Rs 160 for Veg South Indian lunch is a rip-off. BTW they serve non-veg too. We had to kill time till 4.30 pm till the temples opened at Namakkal. Visited two temples by 5.30 pm, had coffee in a little hotel near the temples. Started back around 5.50 to Trichy. We took the Namakkal-Thottiyam-Musiri-Trichy route. It took us around 2 hours. The roads are very good close to Namakkal, gets patchy to bad at times. It is especially bad at a couple of places which I believe are frequented by trucks that transport sand (?).
We stayed at PLA Ratha Residency. A new hotel, clean and well maintained rooms. Rs. 2.4k for a night with breakfast - well, I remember someone said it was around 1.8k earlier this year. I didn't have the patience to go around with my family looking for another place. (Ramya's quoted even higher over phone). PLA have an "Anjappar" in their premises, though it wasn't really a deal maker for me.
We visited the Rockfort Pilliar temple the next morning (started very early). We took an auto who dropped us, waited and picked us up. I didn't want to go around looking for a parking slot. We really enjoyed the visit to the temple. The breakfast back at PLA was good. This was at another restaurant called "Fusion". We filled up a the TVS petrol pump and headed to Mayuram.
Trichy/Thanjavur/Kumbakkonam/Mayuram:
The Trichy-Thanjavur road is a 4 laned road. Initially 2 laned, a bit congested since the bridges are under construction. The drive was awesome, could do really good speeds and very safely at that. We took the Thiruvaiyaru road initially. We stopped to ask for the route and one gentleman decided to send us back to the regular Kumbakkonam route. It was boring - you are stuck behind one vehicle or the other. No matter how many times you overtake a vehicle it won't make a difference to the drive time. We took around 3 hours in all to reach Mayuram (take the bye-pass near Kumbakkonam).
It was pretty hot till Sunday morning when it began to rain. The power cuts are now less rampant, so the inverters get sufficiently charged. I could get some decent amount of work done. (Used Reliance Netconnect+ reliably for those interested)
Return trip - alternate route from Mayuram-Kumbakkonam bye-pass-Thanjavur:
On my way back I took the Kumbakkonam bye-pass-Swamimalai-Kapisthalam-Thiruvaiyaru road. It was a bit better in that we were not forever stuck behind other vehicles for long. We did have a bad experience close to Thiruvaiyaru where there were a huge number of trucks parked to enter a quarry. They were parked on either side and a number of vehicles coming from Thiruvaiyaru had blocked the road. My wife actually had to get down and get the truck drivers to make some way so that the vehicles could proceed. We lost some 30 minutes here. I hope this was an exception and doesn't happen on this route often. (Without my wife's Tamil speaking/reading skills we could have pretty much lost our way on this trip because most road signs in the interior parts are in Tamil).
We again filled up at the TVS petrol pump in Trichy. If someone is interested, there is a Reliance one too on the Thanjavur highway LHS as one approaches Trichy. My wife wanted to eat at Anjappars so we went back to PLA for lunch.

It was packed with the Sunday crowd and it also started raining heavily. I must add that the service here is so-so, but had to keep my wife happy given the long journey. We spent around an hour here. Our trip to Namakkal again took us 2 hours (there was enough light, but the traffic was heavier than before).
Namakkal to Salem was peaceful except for a 25 minute stop due to an accident close to Salem. Gave me some time to get down, stretch and clean my windshield. Once at Salem we stopped for some coffee near a roadside bakery.
The experience at toll-booths as we approached Bangalore:
The experience at Krishnagiri/Attibele toll booth was painful. We spent almost an hour each at these places. You'll find me ranting in other threads about this. I don't know the solution to this - maybe avoid returning to Bangalore on Sunday evenings. But I really hope we could drive more responsibly - it was shameful the way people were cutting into the traffic and muscling out others. People must have lost a good amount of fuel since one really can't switch off the engine - need to keep inching forward.
We had started on Sunday at 10.30 am in Mayuram. I reached home around 1.30 am Monday - lost about 3 hours due to the various jams we encountered along the way.