I had an 85 Charger that would not run on Marathon gas. It would just spit and sputter. My 06 Route 66 PT Cruiser and 07 Ram got the best gas mileage on Phillips 66. I've only used Phillips 66 in my 09 so far.

 

What SubRammer said is partially correct... well it mostly only holds true for Premium. When it comes to regular 87 there is *******ly no difference between one gas and another. They are very similar. 89 has limited additivies, if any. Premium (93 or 91 in some areas) has the additives and extras that really can help your engine, but only if you're using name brand gasoline. The big three Shell, Chevron & Texaco, definitely have good additives. I can't say anything for any other brands. Each company has their own formulation (if they put any in). You can use whichever one you like best, but I'd stick to one particular brand. I say that b/c the detergents from one brand can target the detergents from another thinking they are harmful particles. Nothing bad will happen, but you won't be reaping maximum benefits from the gas you're using.

I, personally, am a Shell fan. I know an engineer that works for Chevron and he said he thinks the Shell formulation is the best and personally runs Shell in his Corvette, GTO, S2000, F350 and CTS-V. So, when I had my vette and ran premium I ran nothing but Shell. But since I run 87 now, I just use whatever is convenient or the cheapest.

 

Was doing a search for locking gas caps and this thread was listed in the result set. I've been running 87 since we've got the truck. Only reason I'm not running 89 is cause every gas station in my area has 10% ethanol in that grade. I've had issues with ethanol blends in the past and will not likely use it again. You guys that are running 89 octane, is it regular gas or is a blend? If it's a blend of ethanol, how's it treating your engine? 89 is actually .10 cheaper than the regular 87 I use here.
I haven't had any issues using 87.

 

[quote=KeepOnTruckin;1670335]A related question:

When I bought my 2002 Porsche Boxter, the salesman told me to only buy Chevron gas. Not curious enough to question, I've done so and try to buy Chevron for all our vehicles.

I don't use Chevron because their oil comes from Venezuala. There are too many reasons that I will not support Hugo Chavez.

 

Better run 89 just to be safe. There have been a few people w/ cylinder damage on the hemi's blamed on people who ran 87 only in the 3rd gens. Check this thread out https://dodgeforum.com/forum/3rd-gen...emis-junk.html at about post 5 they start talking about 87 as the cause.

 

I live in the inter mountain states and 89 isn't an option at most stations. I have been running 91 because 89 isn't available. Mid grade is 87 in most instances around here. Needless to say I am confused. Honestly, I feel no difference or experience no mileage increase or decrease no matter what gas I use. Hence my confusion.

I do work at a race track, do you think I should fill up with 103 or 106 octane one time? Just kidding.... I will save that pump gas for the race cars.

 

You won't notice a difference in daily driving with this Hemi between 87 & 89. Only under certain circumstances (WOT, etc.) does the Hemi need the extra octane and this engine is programmed to adjust for 87 gasoline, so 87 will not damage it. Now if you think the extra money for premium is worth the added detergents, etc., that's a different story....