About a year ago I was working around W 25th & 11th. I'd always tell the cabbie at LGA the intersection (I think asking for an intersection instead of an address makes you sound more like a local) and said "take the tunnel", and never had any problems.
But heading back to LGA from there, I always told them to take the tunnel and often got push back from them wanting to take the Triboro. Sometimes I fought them, sometimes not.