1992 olds cutlass

Hello! I have a problem with my truck and hope you can help me with it. I recently bought a 96 ram 2500 cummins with auto tranny, 4:10 rear, club cab, and 150k miles. I have put a few thousand miles on it, and have some problems. For one, my economy stinks. I am getting 14-15mpg in town and 17-18hwy (hand calculated). The guy I bought it from said he got 25.5mpg at 55 mph, and 22mpg at 70mph. I am consistently reading that folks are getting high teens and low 20s in town and low to mid 20s on the hwy. I personally know of several similar trucks that are par with that. I have tried driving with a light foot, then with a heavy foot, and actually got about 1 mpg better with the lead foot. Another thing, and it's probably related and may help diagnose the problem. I have a small single axle trailer...about 1000 pounds. When I hook it up, the truck turns into a dog. I can't pull out into fast moving traffic without fear. It doesn't want to pull the trailer up to speed. At 45-50 mph going uphill, the truck will barely pick up any speed at all even if I floor it. If I can get the truck running at 2000 rpm, it does ok, but at 45-50, it's at 1700 rpm and bogging. If I lock out overdrive, the engine revs, but falls flat on it's face at 2300 rpm. I know this 1000 pound trailer should be an insignificant load on my truck. As it stands, my 23 year old chevy 1/2 ton with a 305 engine can pull the trailer quicker and easier than the dodge. The turbo bearings feel tight (tolerance-wise) and like they should be. I feel the turbo kicking in once the engine revs up, and it sounds like a turbo should...so I know it's working, although I don't know if it's at full potential. A quick visual inspection of the turbo boost hoses showed nothing unusual. The engine runs good, and idles well. The truck lopes a little (I get a little "hop" feeling in the seat at idle), but I don't hear it in the engine speed...it's more like a reverberation in the truck frame from the vibrations of the engine. Maybe that's normal? This is my first time owning, but not driving a diesel. If anyone has any suggestions, I would be grateful to hear them! I like the truck, but I'd love to feel like I'm getting everything I was expecting. Thanks!

I have started to have an intimintent problem with my 350 chev when starting. Sometimes it starts fine and then it wont. It has to be electrical as there is plenty of fuel getting through. I just went to start it now and it wont start. There is no spark from the plug leads and no spark from the lead direct from the coil. There is power to both sides of the coli with the ignition on. I put on a coil that I had lying around thinking this was the problem, it fired then died and wont restart. Any ideas??? Is it the coil? Im not convinced that it is yet. Aaron