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Just like the title says,what octane are you running in your s/e?
 

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I am using just regular old 87 now. I started with Shell 89 exclusively however...

I have run numerous mpg checks comparing Shell 89 and Caseys General Store 87 and see no appreciable difference in MPG or performance. In IL it'a all 10% blend as well. Plus it's a 20 cent hike per gallon from Caseys 87 to Shell 89.

You'll save a ton of money using 87 with a once a quarter fuel system cleaner.
 

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I use 89 Chevron.
 

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No need for more than 87 in an SE.
Is that what you use in your RT?, because the owners manual says 87 to 89 for the SE and RT .
 

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I am using just regular old 87 now. I started with Shell 89 exclusively however...

I have run numerous mpg checks comparing Shell 89 and Caseys General Store 87 and see no appreciable difference in MPG or performance. In IL it'a all 10% blend as well. Plus it's a 20 cent hike per gallon from Caseys 87 to Shell 89.

You'll save a ton of money using 87 with a once a quarter fuel system cleaner.
That may be Ill but here in S.Florida Shell is veeery expensive over anything including BP.As much as 30 to 35 cents more.
 

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That may be Ill but here in S.Florida Shell is veeery expensive over anything including BP.As much as 30 to 35 cents more.
Shell, BP, Conoco (name brand) all run 20 cents per gallon more than reputable Git-N-Go type stations in my area of IL.
 

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So far, I've put almost 9k on my '10 SE since 1/7/2011--using primarily QuickTrip 87--never used premium--and getting good mpg (probably 22-24--never really checked) even as fast as I drive--Two motors and I were running up to 90mph on the interstate the other day escorting a 2 star general and color guard from Church to Canton National Cemetary--and she runs out GOOD!!!!! BTW-see attached photo of a Henry County Sheriffs car
 

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So far, I've put almost 9k on my '10 SE since 1/7/2011--using primarily QuickTrip 87--never used premium--and getting good mpg (probably 22-24--never really checked) even as fast as I drive--Two motors and I were running up to 90mph on the interstate the other day escorting a 2 star general and color guard from Church to Canton National Cemetary--and she runs out GOOD!!!!! BTW-see attached photo of a Henry County Sheriffs car
Someone has too much money in the budget to be using an SRT8 for a sheriff's car.
 

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Running the 93 tune I have to use 93 premium and Exxon top tier is the most expensive gas. Below is a photo from a V6 that had 3 cylinders run on top tier gas and the other 3 run on cheap gas. After only 10,000 miles the valves are covered with crap from the cheap gas. Why let that crap build up in the motor and then hope to flush it out later with cleaner ? Deposits that build up in the combustion chamber can cause knock so it is even more important for engines running a 93 tune to use top tier gas. Top Tier Gasoline
 

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'Someone has too much money in the budget to be using an SRT8 for a sheriff's car'.

I know Jim--but there are reported to be SEVERAL counties here in Georgia that the Sheriff uses the Challenger--while the deputies use the Charger--recon the Sheriff gets a BIG cut on the price of the Challenger??? I didn't get too close a look at this one as I was on the flagline for an incoming KIA--but I understand that it had all the SRT8 'goodies' and a full complement of lights:)

Attached is my '10 SE on the same escort--
 

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I use shell 87 here in Mo. But in a little town out west of Rolla at a Caseys you can get super unleaded for $3.59 which is 89 so when I'm out that way I get a tank full gas mileage is the same 24mpg no matter which one,
 

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I normally run 87, sometimes 89. It runs fine.
Ummmm,how long have you been using 87?.Im almost convinced.:scratchhead:
 

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Shell, BP, Conoco (name brand) all run 20 cents per gallon more than reputable Git-N-Go type stations in my area of IL.
Here its also all 10% ethanol.We have no GIT-N-go but theres Valero and Westar.:indifferent:
 

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Ive been running 89 for a few weeks now since I read in another thread that it is recommended. I was running 87 for months but I didnt notice or feel anything strange. I also noticed I never recieved the manual for the car since i tried looking into this gas issue. But I figure the couple extra bucks at the pump isnt a big deal. Right now with gas prices, you get raped no matter what you use.
 

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Ive been running 89 for a few weeks now since I read in another thread that it is recommended. I was running 87 for months but I didnt notice or feel anything strange. I also noticed I never recieved the manual for the car since i tried looking into this gas issue. But I figure the couple extra bucks at the pump isnt a big deal. Right now with gas prices, you get raped no matter what you use.
Don't forget in California all of the gas is pretty crap compared to some of the the lowest grade in other states.

EDIT:
I started on 89 when got the car, then I was running 91 for a bit with the predator tune. When gas climbed I went to 89 and matching tune. Now I'm on 87 with a tweaked stock tune to get some spark advance and such, mostly for the throttle and transmission enhancements. They make the biggest feeling difference when using the predator.
 
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