Adding brake horsepower and foot-pounds per second: In January, while Lua Convert is trying to re-reformat 554,000 pages (again) to have more of last year's features, I will revise page "Horsepower" to clarify the text. For "brake horsepower", I have created Template:Convert/ftlb/s, based on: "1 hp =  per second".Using Template:Convert/old, I am able to test new units without complaints about expanding Module:Convert/extra. The system-wide reformatting for Lua Convert, begun 02:15 on 11 December, has been a nightmare, dragging past 13 days (10 should have been enough), and meanwhile people remember how the markup-based Convert formerly offered more features, even before the "paint is dry" on deploying Lua Convert. To check status of reformatting, I have listed Special:WhatLinksHere/Template:Convert/track/adj/ and confirmed over 20,000 of those pages still show precision or results from old Convert. The wp:CS1 cites have run over 48 days to reformat 2.2 million pages to log "month=" as deprecated (without wider consensus) in 155,000 pages. I have proposed at wp:PUMPTECH to just reformat every page, every day, as faster (perhaps skip pages with no major templates). -