let's be BLUNT about this - I tried various "devices" in the past. No success with the Pogue carb (talk about touchy) gave my opinion of the fuel expansion thru heated fuel going into the system (yup, works by increasing the fuel volume - there is a small power loss and a tendency to be more prone to vapor lock if you're not careful - the diesel benefited most from this one), Electrolysis of water - did experiments in school (a LONG time ago) to quantify the energy balance (college project in thermodynamics) - it didn't make enough output to have a particular effect on the fuel consumption, magnets around the fuel lines - gathered metal from the road in dusty areas (fuel increase? IN YOUR DREAMS), SLICK50 - No particular effect (but it was an "older engine" fully broken in - might help with recent bores, synthetic oil - better lubrication (based on oil sample results) but it was changed at 5000 mile intervals, hi-volume low impedance flow air filters - bit better flow but the cost of the treatment when you clean it sort of offsets the power increase, vacuum operated water vapor into the intake - decreased the pinging tendency a bit - but not NEARLY as much as taking a 2 bbl progressive Holley with separate float bowls, diverting the inlet in the secondary to a windshield washer fluid bottle with a demand pump to the secondary float and running it "normally" - at higher throttle openings it would drop the washer fluid (it was cccc-old in Michigan in the wintere) DIRECTLY into the manifold from the inlet jet. For higher power, the fuel decrease was about 20% but the power didn't seem all that much down. on teardown the piston tops and valves were clean as a whistle (ford 390) but it was sort of a pain in the posterior to make sure the tank stayed full. like running in a downpour all the time.
I could go on if I took time to go look at the notes (some of them approaching 40 years old and IF I can EVEN FIND SOME OF THEM)
yes, I've tried most of them as experiments. back in that time frame, it was better to use a manual trans (automatics didn't have locking converters) Even found that running tires at "spec" inflation was 4% FUEL ECONOMY BETTER THAN 5 POUNDS LOW, but the effects of increasing the pressure above 10 over the max recommended didn't help and made tire wear go up drastically.
Been there, done that, bought the T-shirt
I could go on if I took time to go look at the notes (some of them approaching 40 years old and IF I can EVEN FIND SOME OF THEM)
yes, I've tried most of them as experiments. back in that time frame, it was better to use a manual trans (automatics didn't have locking converters) Even found that running tires at "spec" inflation was 4% FUEL ECONOMY BETTER THAN 5 POUNDS LOW, but the effects of increasing the pressure above 10 over the max recommended didn't help and made tire wear go up drastically.
Been there, done that, bought the T-shirt