Anyone have any tips on any mods or anything to get better gas mileage. I have a 2003 Diamante, engine is stock. I just bought a K&N air filter, so hopefully that helps me out. Any tips.............................

Its all about cruise control.

Keeping a clean service record is one. MIne varies a little because i have DOCH GDI MIVEC heads on my model , but using good Iridium plugs is the key . A low restriction induction system i have seen helps , over the factory air box . There are not that many , but a good service and spark plugs are key

yes your right about those. What are some good spark plugs?

no spark plug will increase fuel economy unless the ones you're currently using are actually misfiring to the point of losing combustion strokes. And if you were, you would both know it from the vibration, loss of power and obvious miss, along with the fact that the "check engine" light would be on.

use ONLY factory NGK plugs in a mitsu. Nothing else is worth a ****.

NOt at all , types of spark plugs do matter alot. Iridium tips have better ceramic cores amongst other things . And have a better heat pattern and tip. So in turn they deliver a constant burn rate and spark over a much longer period of time than standard tip plugs. Meaning they will efficiently spark and ignite , each combustion at a way higher efficientcy than normal plugs. Sure regular plugs wont misfire but they are not as well designed for maximum lifespan and heat rate of an engine teh tips and cores are designed to deliver maximum spark for a cleaner combustion and more total combustion over a long period.

So yes, type of spark plugs matter . The effectiveness for the type of design it has to burn the total amount of air to fuel effectively in the cylinder, We use Nippondenso or NGK Iridiums , or go back with the factory type of plug which is a factory Iridium also , but a little less expensive then the optional Iridiums sum times. I would not put a bosh plus 2 or 4 or anything on it . There plus 4 and 2 etc is just a cheap look to try and give a multi high spark like Denso and NGK Iridiums. They have 2 and 4 tips but the diodes on them still lack the heavy duty structure and capability of the NGK and Denso Iridium as well as the tip itself.

not quite.
the ONLY advantage a rare metal plug has over copper is the fact that it doesnt wear as fast. thats it. NOTHING else.
So you will see a benefit using them ONLY if you are the type of person that would not normally change a spark plug at its standard interval.
Meaning this.. if you have normal copper plugs in you car, the interval is usually 15000 miles. If you are stupid enough to drive them to 60000 miles, you have effectively increased the needed voltage by as much as 5000 volts. the rare metal plugs do not wear like that, so they dont suffer the increased voltage requirement.
plug of the same size and heat range will perform IDENTICALLY no matter what the electrode material is made of, provided you are using that plug during its effective lifespan.
ANY plug that says "will increase mileage" is bunk. the marketers are basing that on the idiots that dont do regular maintenance on their cars. As such, any improvement you make based upon worn components WILL in fact raise the efficiency of an engine, because worn plugs cause misfires.





{sigh}
yet another person buying marketing.
1)the number of electrodes does NOT make a better plug.
2)NGKs are routinely the highest quality plug, bar none.
3)using a rare metal plug in a car that doesnt need it (I.E a car that can easily have the plugs changed) is a complete and utter waste of money. Unless you really cant be bothered with the horrible 10 minute task of changing spark plugs.

Im not buying marketing , im in aftermarket and motorsports. And thru my years this is wut ive seen . Plugs arent just plugs. Thats just like saying , because Ford Mondeo V6 plugs look the same as mine in my Diamante my car will run the same. Sure they will fit , but my car will not run the same at all.

you're right in that plugs arent just plugs..

almost anything other than factory plugs (in a mitsu) are pure garbage.

thats MY experience in 17 years in the auto industry, and working on over 9000 cars at a minimum. The real number is probably double that.

The amount of years yu can work in an auto industry and amount of cars will not make yu better than the next person. Trust meeh . Sure cheaper NGK plugs will wor the same as Iridiums to a certain extent , but overall it will not outperform an Iridium , or muti core plug. Standards are made to to take a certain burn rate and temp , even the ceramic itself.

Get a bad batch of gas with standard plugs. They will foul out and the tops will be detroyed. NOt the same as Iridiums and multi core plugs. Its just a fact. Thats why many automakers now are requiring when the vehicles are serviced to use onlee platinum/iridium/ and other high life oem plugs on vehicles. Lots of it frum Bosch is propeganda and marketing (i wouldnt put their plugs on my dirtbike) All we have in teh shop are Iridiums, Multi Core etc. Mostlly because my clients go lots of driving and dont service their car in while a time. But i think they are superior plugs to standars. I mean if the monies isnt there as it is for sum clients i do put standards , but Iridiums/Multi Core etc are more efficient current and over time.

I'd like to see the spark plugs on my 2004 diamante in 10 mintues - no way.