I say - ignore the doubters & use the helpful people here & tips to make the best of what you have !
There is nothing wrong with taking your F250 and increasing it by even 10% is a big deal for the pocket book.
Here are my first few suggestions;
1. LEARN your trucks torque & at what speed it shifts into its highest gear. With the diesels you should be able to run the high torque to your advantage by low RPMS but staying in a high gear to increase your MPG.
2. If you can, change your tires to a lighter/smoother road tire. Less rolling resistance and less spinning weight of rubber will increase your MPG a TON.
3. Tonneau cover. Easily removable/foldable for when you are pulling your fifth wheel - but when you are just driving around - ESPECIALLY with a long box on a truck - it will reduce the drag on the back of your truck & increase your MPG's 1.5-3% at least.
4. Block off your grill when you can (NOT when towing) and it will catch less air. better MPG.
5. CLEAN OUT THAT TRUCK. Trucks have a tendency to carry a lot of stuff (tools, extra fluids, junk, etc.). Less weight means less gas burned to move it.
6. Maintenance. The more slippery your oils/fluids/greases are, the easier your engine parts move & the less work = less gas burned to move you down the road.
These are just a few things to start that are inexpensive and easy to do right away.
LET US KNOW HOW IT GOES !!
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