OK, I'm braced for the flaming but he're goes...

My wife says "no stinkin' little cars in this family, full sized SUV or big cars ONLY!"

so what's my best option? I'm driving a 98 dodge ram 1500 2wd extended cab, getting about 14mpg on average, probably 1/2 highway, 1/2 city, 15,000 miles per year, pretty average. I drive 5 miles to work, home for lunch and to run the dog, then back, then home again. I live NW of Chicago. I plan on biking to and from work 3-4 days per week (I work 4 1/2 days/wk) when the snow finally melts, have biked a few times already-today I ran errands on the bike and saved 15 miles in the truck (video store, supermarket, tile place, and bank). The truck is paid for, runs well, has 157K miles on it. Maybe I should just keep it and use the bike as much as possible? Or switch to a big car, drive carefully, and try to average 20mpg? Cost of vehicle is not too much of an object.

Opinions please! Thanks

PS, try to limit the "who wears the pants in your family?" comments....thanks