1) You may be able to download the generic Gulf Stream Motorhome Owner's Manual from their website.
2) Dunno.
3) What engine is this? If it's the 8.1L gas engine, that's about what it gets.
4) Go to the tire manufacturer's website and look up the recommended pressure vs. weight table for your particular tire. You probably don't know the weight on each tire, so you may want to go to a public scale and determine the weight on each axle. Moving companies sometimes will weigh you. Put the correct pressure in your tires and then re-evaluate your ride.
5) Economy mode will upshift earlier, sometimes saving gas -- particularly in flat country.
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