I will keep the plugs in mind next time we do a tune up. How often do you recommend for tuneups? Also I got a coupon from my hummer dealer in the mail says "nitrofill $24.95 normally $50. Improves fuel ecomonmy 10% and tread life 30%, reduces tire failures up to 50%, improves braking and handling" can this stuff be true? What does it do besides just keep the pressure a constant pressure, if you check pressure regularly , does this have any benefit?

 

I get between 10.4 and 11.8 depending on the right foot. Right now it's at 10.5. It's good by me though.

 

I used Nitro in my tires before in other trucks, really liked it, I am waitng for my dealer to give me a deal on the fill, they chrage $75 here for it, looking for a deal!
Does it really help?? Who knows but your tires do stay constant with pressure.
As for ethanol in the gas, it is hard to find any here is Toronto that does not contain it unless you are going to a higher Octane fuel, Esso, Shell, Sunoco, Petro Canada, even Canadian Tire Gas Bar does it, I haven't seen any that offer the Regular fuel without Ethanol.

 

The nitrogen makes a BIG difference. The tire pressure remains constant at any temperature. With large hummer tires you must deflate and inflate about 5 times to get a complete fill. I would suggest going to your local welding store and getting a nitrogen tank yourself and the regulator and a hose and pressure gauge thats used on any air line. $75 is way too high. Dealers down here do it for $5 a tire.

The spark plugs - well, my idea of a tune up is this : Change oil and filter, clean the air filter (if its a k&n etc), lubricate chassis (find all the zerk fittings), lubricate all doors and hinges, clean the MAF sensor wires with the cleaner spray, change the spark plugs. The non iridium/platinum plugs can go for 24-36k miles usually. I do it every year.



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looking for Nitro cheaper in Brampton or Etobicoke

 

24-36k on plugs doesnt sound like alot... how long do the stock plugs run 100k? I can't go to 24k on limos , we'd be doing tune ups every week

 

I put 50K on the H2 without changing plugs with no issues at all.

 

The plugs I use are NON platinum or NON iridium. In the case of non modified engines - use the NGKTR55IX they last a long time.



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So the NGKTR55I plugs will last 100k ?

 

I been getting between 10.2 and 12.4 around town with 37" tires. The economy drops to like 2 or 3 when I am first taking off, so I pray for green lights......