I know that's the Conventional Wisdom™, since I routinely dispense it myself as a bicycle mechanic of many years

But while I wouldn't run my drivetrain in the big-to-big combo for
extended periods of time, I do routinely use that gear combo when it suits me better than shifting to a different chainring. I'm not repentant about it. My commuting bike's not a shelf queen, it's
a tool with a job to do, and despite what people may have been told, using the big-to-big combo does not automatically make stuff blow up, it's just not the gear combo you want to use
ad infinitum 
So anyway, to each his own. For me, the small chainring is for climbing hills, the big chainring is for everything else. Maybe I'll sing a different tune in another 30 years
I undoubtedly used the big-to-big combo on this ride. Probably doesn't matter much.
Robocop, here's another tip for road cycling in groups. When a rider stands up to pedal, the act of standing up tends to make his bicycle itself jump backwards about six inches. In the event that you have someone riding in your slipstream, if they're closer than six inches, you could take them down. When riding in that scenario, if you're going to stand up, try to ease into the standing position and/or conciously apply enough extra speed to counteract the effect. Tangentially, be aware that this could happen if the person in front of you changes from seated to standing (although as a newcomer, you probably don't intend to get that close). Also, if you're in a group which is riding in a "paceline," try to avoid sudden changes of speed, particularly braking.
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