Originally Posted by fumje

Seems like there are two likely possibilities and one unlikely possibility (by my judgement): 1. it would be 10x points and credits applied for $300 in lyft charges, but then the first $300 in travel (after lyft charges) would get no points and no credits; 2. the lyft charges would be no points and credits applied; or not very likely 3. the lyft charges earn 7x points and get credit applied, and the first $300 in travel earn normal 3x points.

Given that 1. & 3. earn points equivalent to using the first $300 on other travel and 2. earns less, it seems inadvisable to try front-loading lyft charges.