Yeah, I was thinking that the Sirrus would be a better choice for attacking the hills. Hills aren't part of the current equation, but...

The "Sag Wagon" is an older Suburban. Currently wife makes 2 25 mile R/T's to drop me off and pick me up from the closest bus stop that works with my work schedule. If I start riding from my place to that bus stop (lowest traffic volume) or home from the bus stop (rush hour), then I would cut the fuel bill in half + save on the other wear and tear stuff.

These bikes are right around $500. My 'Burban has a 42 gallon fuel tank. Last time I filled all the way up from the fuel light being on cost me just under $100- and the prices have gone up since then. My logic thinks that the new bike would pay for itself in roughly 10 months, faster if fuel prices rise. Of course, that RIT estimate doesn''t take into account better lighting, upgrading my cycling wardrobe/winter gear, and consumables which I'll incur regardless if I get the new bike or not.