Ludwig- get a tandem, you'll never be alone again.... in a good way... then your speed is only dependent on how much you both push on the pedals [you can tell]. It's great for getting really good work-out training while your partner can contribute as much [it's like having electric assist], or as little, as they want.
+ they are in control of looking around, passing the sandwiches and drinks and generally keeping the conversation going while you get your breath back at the top of hills.
+ the photos!
It's not easy taking a photo eating a cheese and coleslaw roll.