Paying more attention to cadence will increase your speed and distance. I have seen a 3mph average increase since I started trying to keep my cadence above 90. I also notice less fatigue over time because keeping my cadence higher tends to keep me in easier gears to maintain my cadence. I ran an 8 mile trail the other day just keeping my cadence above 90 and finished it with an 18.5 mph average. Last time I went out that trail I thought I was hitting it pretty hard with a 14 mph average (before cadence). I made it back with a 17 mph average but had wind in face.