I combed through the "post your latest" by searching "Toyota" and checking original posts (admittedly imperfect search and probably a small subset of the BITOG population who actually posts their latest change). I added responses from this thread so far. Only 49 responses.
Here's what I have with all responses:
17 (35%) using Toyota WS
16 (33%) using MaxLife
4 (8%) using AMSOIL OE Fuel Efficient
3 (6%) using Idemitsu TLS-LV
49 Total Responses
Excluding the 5 Hybrids, Maxlife jumps to most popular in this tiny & incomplete dataset:
16 (36%) MaxLife
13 (30%) Toyota WS
4 (9%) Amsoil
*I hypothesize hybrids are more commonly WS due to their being quite specific to Toyota and folks being risk averse. 4 out of 5 were on WS, 1 of 5 on Redline D6.
This is similar to the 16 poll responses before it was removed which had 8 WS, 7 MaxLife, and 1 other.
I can continue to add responses posted after this.
I've seen lots of opinion on the 2 most popular fluids. My goal was to see what actions people are taking in order to provide some context for the discussion of WS or its alternatives. Sometimes talk is cheap. I think it's informative to see what folks have actually done. Thanks for all the replies so far.