I'm at the Long Wharf Marriott in BOS just now, and took a cab from the Logan. Paid by CC, and was prompted as to a tip from a screen in the payment system. I could choose 20%, 25% or to type in my own amount. And mind all readers, 20% or 25% would have been calculated no only on the fare, but the $7.50 toll charge. Is it me, or is this a bit overreaching? As much as I deplore the entire North American custom of tipping (which now entails tip jars at my dry cleaner), I recognize there is a bit of a social compact between customer and typically-tipped service providers (which does not include dry cleaners). And I act accordingly. Is it a bit much for a taxi to intimate that a 25% tip - including tolls in the base - is reasonable? Off my soap box.