I'd want the "Taming of the V10" more than any tidbits of MPG improvement myself. It should be able to pull mild grades that cause it to downshift when running in cruise. I heard that the cruise tolerance is too strict, causing it to kick down before it loses about 0.5-mph. But I also believe that the engine's fuel management strategy is so stingy that it has to downshift for a load that it could easily pull.
Far as buying upgrades, several of us got Hellwig sway bars through SDTruckSprings and I was pleased with my order from them. I haven't bought a Safe-T-Plus, but an OP here found he could get one through a truck repair shop for a lot less than RV supply prices. It would be the "140" series S-T-P, but remember you need a Bracket Kit. You should have an OEM Stabilizer, but the brackets aren't big enough. I got AirLift airbags through Amazon. Our rear Track Bar is a BlueOx TigerTrak, same bar as SuperSteer, but I got it through an RV supply. Could probably track that down if you need. In the meanwhile I'd say include MakariosRV in your searches. All this is relatively easy DIY install. Track Bar was a little tricky, and S-T-P might need several easy adjustments. Sway Bars totally straightforward. Shocks on a Ford aren't the easiest but still do-able. We've only had one OP report on the new Koni FSD's and that's mixed. I'd say Jury is Still Out on those.
If we want to discuss this further, should probably open a new thread... Send me a PM if you like.
