OK lets do the math.
3/4 ton truck 100,000 miles=
1 brake job
1 set of tires,
1set of shocks
Zero tune ups
10 MPG going to work
1/2 ton truck
2 sets of P metric tires
2 brake jobs
1 set of shocks
Zero tune ups
Maybe 12 going to work
Hummm. I just don't see 12,000 dollars difference there? Maybe my math is off a bit, but the heavier duty truck will last longer all around because of the stronger components. Modern trucks if properly equipped will return fuel economy nearly identical . Remember to get the higher towing capacity you will still need the biggest motor in the 1/2 ton, same motor as used in the 3/4 ton. So where is this hugh fuel difference coming from?