I'm going to be running about 180 miles round trip tomorrow and I was thinking about running a fuel additive. I always run premium because I feel that my ride runs smoother when I do. What are the good additives to use? I would like to hear everyone's personal experiences with fuel additives.

 

dump some sea foam in the tank i ove the stuff. im sea foaming on sunday

 

Is it worth it to run Premium?

 

Its 4.05 for premium here and 3.85 for regular. I sure as hell don't ever use regular gas due to the ethanol. I guess I could use midgrade but it isn't like it kills me to fill up with premium or with regular. Have you ever experimented with different grades of fuel?

 

I don't think the 4.0 needs premium. I run Conklin's Fuel Mate Plus in all my vehicles (1 oz/10 gal). Improves mpg a little, keeps fuel system clean (that's the main reason I like it), and will also stabilize gas.

 

premium is a waste of money in youre vehicle (cherokee) however it is required in my srt8
save youre money read this
http://blog.truecar.com/2011/03/03/p...s-regular-gas/

http://www.consumerenergycenter.org/...s_premium.html

 

I filled up with mid grade ( can't bring myself to use regular.) and added about 1/2 a can of seafoam. So we will see how this pans out.

 

Run the cleaner brands of fuel like bp or shell 87 octane is fine.Most of the fuel additives are alcohol or ethers based which does the same job as the 10% ethanol will do.

 

here in my country gas is very cheap and i don't use premium for the jeep we have 91 ,95 and 98
91 is fine its just waste of money to use premium for the jeep
also if you use premium all the time when you go back to regular you well have small issues (cut off , jerking etc

 

Lucas upper cylinder lubricant. i use it in all my cars it wont give you a 100hp but does make a differance

 

its all in your head. just switch back to regular, premium has nothing to do with making you engine "run smoother". the difference between the grades is the octane rating, which can determine the point at which your engine starts pinging. higher octane = more resistance to pinging. your XJ (assuming the 4.0 is stock) will run no different on 91 than with 87.

stop wasting money and just buy regular

 

Bzzzrt - close but not quite.

While its generally sane advice (higher octane rating is BS for low compression engine), the complete picture really depends on brand as to what the ACTUAL composition of the different grades are.

In these days of centralized refineries, the additives really make the difference in long-term performance and fuel economy. Third-party cleaning agents like STP, Lucas, Seafoam, etc only really work if your system is filthy in the first place. Many retailers increase the level of detergents and other additives as you go up in octane rating.

Anyway, switch to buying gas from one of these guys: http://www.toptiergas.com/retailers.html Run real gas long enough and you should never really have to do any fuel treatments again.

Another factor is the amount of ethanol blended in. Some engines actually run better with a bit of ethanol, some seem to do well on pure gasoline. Locally, Shell sells a 91 octane rating blend that is ethanol free. 89 and 87 are 5% and 10%, respectively. Some folks have experimented and observed better fuel economy on 91 Octane fuel, and calculated that they actually saved money over purchasing 87 with 10% ethanol. Based on stuff I've read this varies widely between vehicles so you'd have to experiment to come to a conclusion.

 

I used seamfoam in the gas over the weekend. Honestly, it helped smooth out the idle and made it seem a little more snappy. I would use it again.