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Dodge Ram Mileage Improvements
Cold Air intakes ? - they are sold with the theory they will save you up to 10% in MPG and add more poines. I have read that the oil based filters caused some O2 sensors to fail earlier than expected, causing a decrease in MPG.
Exhausts ? Cat Back? Headers and true duals? - I am skeptical of the cat back systems, aside from them making your truck louder.
High Flow Cats?
Synthetic oil? Can I use this in my 98 dodge ram with 104K miles?
Computer programmers/chips? I have read reviews on auto part sites stating they do nothing and are very expensive.
Tire Size - going smaller will help? (width)
Tire Pressure - inflating to max psi will help? This I know for sure, but lets hear your take on it...
Spark Plugs - what works? I have seen this area of the market change drastically over the years, and some aren't cheap. What really works?
Iginition systems - they are pricey, but does it do anything for MPG?
Electric Radiator Fan - heard two sides about the electrical load will cause more drag from the alternator, and that while driving over a certain speed your clutched fan doesn't cause any drag.
Low drag pulleys - they change the speed of the rotation of your belt driven components. Does it have a negitive affect on them? shouldn't they be spinning at the factory speeds?
and the biggest myth I know, and have facts to prove they don't work, but like to hear people try to convince me of it... the tonneau cover / the dropped tailgate / removed the tailgate. They DO NOT SAVE you gas. I get 0.5MPG LESS with mine in the city. My proof (I know I have posted these links a few times, but here they are once more).
MythBusters Episode 43
MythBusters Episode 64
now on to what I think are just gimmicks...
Waxing your car to reduce air drag
Tornado Fuel Saver
Fuel line magnets
add-on blowers (the hair dryer type)
What has worked for you? I would ask that you state your truck model, year, 4x4 or 4x2, fuel type, and all those add-ons that worked or didn't work. Use real MPG numbers, not what your computer display is telling you. I found that if I spend over $1200 in add-ons I could save up to 20% in MPG, but thats a lot of money to find out I didn't and is it worth it on a 1998?
this is a great site also, http://fueleconomy.gov