this is the fabric protector. The bottle has definitely changed since last time I used it, it used to be convertible top protectant. Maybe I got a bad bottle.
Marginal performance that 90% of drivers will not feel or benefit from. Coming from a cost analysis here. If the grades were priced 15 cents apart like they used to be, I'd say go for it! Personally, it's hard to justify over a buck per gallon more for 91/93