Hello, I was chatting with a coworker who told me that all cars need cleaning of the injectors every 30 to 60k. Heck, I have a 98 Civic and a 2000 Civic and, to me, they run perfectly well with about 100k miles on them. Isn't it that if anything goes wrong with the engine (including clogged injectors), then the mileage will drop? Both cars exhibited a mileage increase from day zero to up to about 3 years of use, then stabilized to about 34-36mpg for 50/50 city/highway driving. So, is it true that sooner or later the servicing will have to include injector cleaning or is my mate bs-ing? Thanks