1995 Chevrolet Silverado Z71 6.5 TD
If it is only one cylinder check out sleeving that cylinder.
If you think your fuel prices are high, try the UK for size. Diesel is currently $11.25 a gallon and still going up! 😱With the high fuel prices. i have been doing things to improve Mileage.
Took off my Mud terrains and put on highway tires. 285x17
Aligned the front end for best fuel mileage.
Cleaned my air filter
Checked fuel system tank to IP.
Changed oil Rotella T6
Changed Trans, xfer case fluid, front and rear diffs to synthetic
Removed lumber racks.
Installed the stock front air dam I removed many years ago.
Should help a lot. Just switching out to highway tires gives me 2-3 MPG on the freeway.
Havent checked mileage. But boost pressures going down the highway are 1-2 lbs lower now. That was my goal .
Less air= less fuel.