Do you still have to put 89 octane in the 09 with hemi? cant use 87?

 

You can use 87 octane, but optimum performance is achieved with the 89.

 

Your engine has a knock sensor that under heavy loading or acceleration may cause the computer to retard the timing a bit resulting in slightly lower performance. Under normal light loading and highway use, you will gain nothing using 89.

 

I know in the manual it says 87 ok, 89 recommended. Myself and 3 of my co-workers all who own 2009 1500's fill them up with 87. It was like a disease, once I got mine early January, the rest followed. I guess we are all still numb from paying 4.50 a gallon, plus we all had older dodges and always put regular in them. Question..are we hurting the engine are we losing mpg's. None of us tow anything and were only breaking 75 half of the time,

 

I assure you that you are not losing any mpg. Detonation can be tough to hear in an injected engine. Your knock sensor will protect your engine from damage, but will decrease some performance if it kicks in. You should be fine with 87.

 

iv run 2 takes with 89, and 2 tanks with 87
and i haven't noticed any difference what so ever
in mpg, or performance

 

In my 06 I lost a few mpgs after trying it for a few weeks according to my comp and mileage but im not sure about the newer models.

Also tuning with a superchips tuner it seemed I burned more faster using low grade then supreme but I didnt keep track of it.

 

I use the budgetane rating. As long as my budget can afford it I use the recomended 89 octane, when the price of 89 hits $2/gal I drop to 87 ocatane. However, if I am towing the trailer I will only use 89 no matter what it cost just to be on the safe side. Jeff.

 

stick with mid grade, but with winter gas, your not going to get the best mpg with reg, or mid grade, once spring is here, mid grade will give you better performance and mpg, mid grade is also a cleaner burning flue that reg, Dodge say's mid grade is better, down the road mid grade will safe you money.

Don't spend 35 grand+ and than put garbage flue in it ...

 

I don't put garbage flue in mine, I put 87 octane fuel though....

When it comes to gas, there's not much difference between 87 & 89 except for the Octane rating. In order to maximize your engine's potential during hard acceleration, towing, etc., you should run 89. If you're not too worried about that, the 87 will be just fine. There should be absolutely no difference in MPG and your engine's knock sensor will fully protect you from any damage (and from that extra bit of power at WOT).

Now, if you chose to run say 93 Octane from a quality station like Shell or Chevron, then you would see some difference in the long run (not from 89). The additives that Shell and Chevron add to their gasolines will help keep your engine running cleaner for longer. The cheap stations don't have these additives in their 91/93 Octane gas. However, if you choose to go this route, stick with one gasoline brand at all times. The additives from Shell are different than from Chevron, and if you switch gasoline brands, then one brands' additives may work against the others', thinking that these additives are bad and working to remove them, etc. I learned a lot about gasoline on the Corvette forums. IMHO, Shell is the best. My buddy's dad worked for another brand for 30+ years as an engineer and recommended Shell himself. That's what he uses in his CTS-V and GTO.