Just some math for fun. If you drove to work 5 days a week and work was 10 miles one way, you'd total 100 miles a week. Say your truck gets 16mpg at $4.75 a gallon. Thats $29.68 for the weeks worth of driving. Now say you rode a bike to work one day a week. You can average 15mph on a bike fairly easily, meaning it would take you 40 minutes and some decent exercise to get there. You still end up going 100 miles total for the week but end up spending $23.75 in fuel. If you combine your biking mileage into your trucks mileage, your price per gallon would drop to $3.80! If you rode two days a week diesel would theoretically be $2.85 per gallon. I realize you cant realistically combine biking miles with vehicle miles to get a "new fuel price" but its fun just to see the numbers. Its possible to do unless you live in a very rural area where a bike ride to work would lead you through mountains and snow and leave you with a good thick coat of sweat and a brown racing stripe up your back.