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  #1  
Old 02-18-2012, 02:56 PM
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Default K&N, spark plugs, Synthetic oil for MPG

A friend of mine has a 300 with the hemi. He was complaining to one of his friends one day about only getting 12 mpg in his 300.

He had a Chrysler guy(his friend) tell him that engines over 40,000 miles need new plugs. The chrysler guy also told him to gap the plugs .010 bigger than factory setting and use synthetic oil with a K&N filter. This got my friend up to 17 mpg in the city with his Hemi 300.

Has anyone tried this on their dodge or heard of this being done on any chrysler vehicle?
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Old 02-18-2012, 11:29 PM
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If his air filter was clogged, I could see this as a possibility. Sometimes it's simple things like checking/adjusting your tire pressure that gives the most back in return.
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Old 02-21-2012, 01:27 PM
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Bad plugs can do this as well. 40,000 miles on original plugs is quite a bit.

In any case, I don't even get what most people are averaging with the 4.7 engine. So I'm going to test this out.

Normally I get better gas mileage if I stay around 70 on the expressway but it doesn't help with this truck. Other things I've tested but not with my dodge yet is filling up at half tank. I don't know why but this has given me 2 to 3 more mpg. I was told this by someone years ago and didn't believe them. So I tried it. And it definitely works.

I drive 50 miles round trip and 48 of it is expressway to work and still only average 12.5 at best and 11.5 at worst MPG with cruise usually set at 70 give or take. One thing I noticed with my truck is it doesn't keep steady speed. It slows down and the cruise finally kicks in after the speed drops about 5mph. This isn't very economic for saving fuel.

I've also tried midgrade as well as premium and get the same numbers.

So I put in the K&N already and filled up my truck last night. I'll be doing the oil change to full synthetic this weekend. I'm going to wait and get numbers from this first before I change the plugs so I can have some break down of the results instead of everything done together.
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Old 02-21-2012, 04:20 PM
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That sounds like an unreasonable gain (although his starting mpg seems way off for that car...). Biggest factors in mpg are tire pressure, cruising speed, and rate of acceleration. Plugs, air filter, etc. usually only become critical if they are ignored or not serviced properly. Many new vehicles use longer lasting iridium plugs that can go 100,000 miles. My 4.7L uses iridium on the lower bank (good for 100,000 miles) and I believe copper on the upper bank (I think good for 30,000 to 50,000 miles or something like that). I have nearly 60,000 miles on original plugs and runs fine and gets good mpg.
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Old 02-22-2012, 08:27 AM
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Quote:
Originally Posted by snrusnak View Post
That sounds like an unreasonable gain (although his starting mpg seems way off for that car...). Biggest factors in mpg are tire pressure, cruising speed, and rate of acceleration. Plugs, air filter, etc. usually only become critical if they are ignored or not serviced properly. Many new vehicles use longer lasting iridium plugs that can go 100,000 miles. My 4.7L uses iridium on the lower bank (good for 100,000 miles) and I believe copper on the upper bank (I think good for 30,000 to 50,000 miles or something like that). I have nearly 60,000 miles on original plugs and runs fine and gets good mpg.
Well whatever the case may be, whether the previous owner didn't take care of it, never did maintenance, or my friend has a heavy foot. These are real gains from what he was getting the first few months after buying the car.

Everyone seems to have different results. My truck for instance.. i don't get anywhere near the 17 mpg mark everyone else claims to be getting unless i change the units to km instead of miles and trust the EVIC unit. But this unit is off usually by 2mpg in my truck and I NEVER get 17 mpg, not even with the factory wheels and tires.

On another note, I had a new 2008 F150 5.4 4x4 full size 4 door truck a few years back. Everyone in forums was getting 14mpg on the highway and 12 in the city. I was getting 17 on the highway and 14 in the city. And this was with aftermarket 20x10 wheels as well.

My point is, sometimes extra tricks work, and other times it doesn't. I will post my results.
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Old 02-27-2012, 06:32 AM
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Default K&N filter

Well, as suspected, no gains from the K&N filter. I put Mobil One Super Synthetic oil in this weekend. This is the second phase. Within the next couple weeks I should be able to do the spark plugs although it looks like it will be a pain in the ars
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Old 02-27-2012, 11:07 PM
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Quote:
Originally Posted by yates367 View Post
Well, as suspected, no gains from the K&N filter. I put Mobil One Super Synthetic oil in this weekend. This is the second phase. Within the next couple weeks I should be able to do the spark plugs although it looks like it will be a pain in the ars
I definitely noticed an increase in mpg when switching plugs. I think they are more critical than some give credit.
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Old 03-05-2012, 04:44 PM
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Ok, well no increase in mileage with the synthetic either. But it did create an oil leak. Went back to conventional Sunday, oil leak gone...
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Old 03-05-2012, 07:35 PM
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Quote:
Originally Posted by yates367 View Post
Ok, well no increase in mileage with the synthetic either. But it did create an oil leak. Went back to conventional Sunday, oil leak gone...
You got an oil leak from switching to synthetic? Something is wrong...I've run full synthetic in the last 5 vehicles I've had, for the past 15 years. I've never, ever, had an oil leak caused by the oil. Ever!

There's more reasoning behind the leak than the mere fact of going synthetic.
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Old 03-05-2012, 09:09 PM
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^agreed. And how did the leak just stop after switching back to conventional? Doesn't make any sense.
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