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Don't expect propane to give you a big boost in mpg.
Once you add up all the gasoline and propane you may see a 1 or 2% difference.
Right now for me propane is $2 per gallon. But propane only contains around 3/4 the energy of gasoline so you burn 25% more.
Ozone generators, hho generators are all scams.
Nitrous oxide is very expensive, plus if the nitrous leaks into the intake while the car is off and you go to start it you can blow the intake manifold off the engine as soon as you go to start it.
Running the heat while the car is off will only really work for as long as the little bit of coolant in the heater core stays warm. So you will maybe have heat for a minute or two.
Try a low rolling resistance winter tire.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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