"Don't know diddly about 900 ECUs, but that makes no sense to me as some cylinders would be getting a squirting on the exhaust stroke. Sounds like a lot of backfiring and waste of gas. "

Yup, Amarin is correct on all points for both Bosch and Regina fuel. Batch injection works smoothly, and it takes some thought to counter the intuitive.
--
Art Benstein near Baltimore

“Never underestimate the difficulty of changing false beliefs by facts.” --- Henry Rosovsky

Henry Rosovsky was a longtime Harvard professor and administrator. An expert in Japanese economic history, the elder Rosovsky was chair of the economics department from 1969 to 1972 and served as dean of the Faculty of Arts and Sciences from 1973 to 1984 and again from 1990 to 1991.