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i've now ran over 60 hours, and probably 3000 miles give or take on the system i described before, and after some tests, i have the pressure set at 10 psi, i put a guage on the end of the hose going from the regulator/valve assembly up to the intake, and at 2100 rpm i was reading 7psi, so i figured that running 9 psi will give me around 2 psi propane at a steady 75mph, i saw at least a 3 mpg gain, my best tank so far was to kansas city and back from my house, keeping it at 65 pretty much the whole time, NO CRUISE, and i got 33 mpg. my computer was reading 38. somethin, but the math was 542 miles and i was sitting at 3/8 of a tank, i put just over 16 gallons in!! before the propane i was getting just under 30 on the same trip. not to mention that unlike all my other oil changes where my oil is the usual nasty black, after over 6k miles since i installed the system, half of which or more i was running the propane, my oil looks as clean as it was when i put it in, it is an almost ridiculously clear amber color just like it was when it came out of the rotella t bottle. i do think that i should put the feed on the negative pressure side of the turbo, but i just think that having propane running that close to the exhaust gasses seems really risky. the 20 pound tank im using still isn't quite empty, i can feel it's gettin pretty light, but i still get 10 psi at the guage, so it's still got some left in it. considering propane is 12 bucks for a 20 pound tank that lasts over 3k miles, and adds 3 mpg, it is defintely worth the money.
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