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  #25  
Old 05-27-2014, 04:20 PM
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Re: Should I use REC 90 gas in my V8?

I use only ethanol-free gas in my small engines (mowers, weed whackers, edgers, etc.) Regular 89 octane in the Jeep, though. If it weren't so expensive, I would go ethanol-free in it, too.
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  #26  
Old 05-27-2014, 04:48 PM
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Originally Posted by loveracing1988 View Post
I second this, a lot of mechanics will just say it is thr ethanols fault when it is just old gas or water in the gas. Anytime I fill a gas can for lawn mowers and such I will put stabil in as well, I've never had a problem with it.
The counterpoint is that there is a safe limit for most engines and the EPA/ethanol producers are trying to push past that and dispense 15% ethanol at the pump. Several vehicle manufacturers have been trying to inform users that >10% ethanol can damage engines and that it won't be covered by the warranty.

My newer yard equipment have warnings about not using >10% ethanol printed on their gas caps.
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  #27  
Old 05-28-2014, 05:10 PM
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Re: Should I use REC 90 gas in my V8?

Ran across an article today regarding myths about fuel economy. One of them...

Myth: Putting premium fuel in your vehicle, even when it doesn't require it, will give your gas mileage a boost.

It may seem like premium fuel equates to better fuel economy, but you won't see even the tiniest jump in your mpg by using premium fuel in a vehicle that's designed for regular.

In fact, it's just a waste of money, Molla says. Premium will cost you about 15 to 20 cents more per gallon, which can add up to $100 or more per year over time, according to the Federal Trade Commission.

In addition, "Using a higher-octane fuel than is recommended will have no effect on performance or fuel economy," Molla says.

How to save: The FTC says that unless it's recommended by your owners manual, don't spend money on higher-octane gas.

Read more: 6 Busted Fuel-Economy Myths To Save On Gas | Bankrate.com
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  #28  
Old 05-28-2014, 05:33 PM
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^^^^^^^^

Yep, absolutely you have to have your ECM tuned to the octane used or the current lower octane tune will adjust timing and blow unspent fuel out your exhaust.
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  #29  
Old 05-28-2014, 06:04 PM
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Re: Should I use REC 90 gas in my V8?

Couldn't find any REC 89.....but trying it for the ethanol-free not the 1 octane difference.
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Old 05-28-2014, 06:36 PM
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Couldn't find any REC 89.....but trying it for the ethanol-free not the 1 octane difference.
I would too if we had it round here
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Old 06-12-2014, 05:09 PM
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Re: Should I use REC 90 gas in my V8?

Just filled up a second tank full of REC 90. After that, will try standard mid 89 and see if I can tell any difference or not.
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Old 07-12-2014, 03:22 PM
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Re: Should I use REC 90 gas in my V8?

Two tank fuels of REC 90 - 12.2 and 11.9 MPG respectively with a 2014 GC 4x4 V8 mostly if not exclusive city driving with a fairly heavy foot and NO towing. So, 12 MPG with the REC 90. Just filled up with Mid-Grade 89. Will see how it drives and MPG.
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  #33  
Old 07-12-2014, 08:47 PM
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Quote:
Originally Posted by Dan JGC View Post
Two tank fuels of REC 90 - 12.2 and 11.9 MPG respectively with a 2014 GC 4x4 V8 mostly if not exclusive city driving with a fairly heavy foot and NO towing. So, 12 MPG with the REC 90. Just filled up with Mid-Grade 89. Will see how it drives and MPG.
Wow that seems really low. Do you know what you got before using the 90?

It will be interesting to see what you get now with 89.
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  #34  
Old 07-12-2014, 08:57 PM
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Re: Should I use REC 90 gas in my V8?

Quote:
Originally Posted by seeingwhite View Post
Wow that seems really low. Do you know what you got before using the 90?

It will be interesting to see what you get now with 89.
City MPG for a GC V8 4x4 is 14 MPG so 12 MPG isn't too bad. Lots of starting and stopping and I don't hold back....granted not a total lead foot but I don't drive trying to conserve since i don't really put that many miles on it anyway. There weren't any real highway driving on it either recently.

Will see if REC 90 versus Mid-Grade 89 makes any difference in mileage or performance.

What MPG are other V8 4x4's getting with mostly city driving in the real world?
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  #35  
Old 07-14-2014, 06:41 PM
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Re: Should I use REC 90 gas in my V8?

Quote:
Originally Posted by Dan JGC View Post
City MPG for a GC V8 4x4 is 14 MPG so 12 MPG isn't too bad. Lots of starting and stopping and I don't hold back....granted not a total lead foot but I don't drive trying to conserve since i don't really put that many miles on it anyway. There weren't any real highway driving on it either recently.

Will see if REC 90 versus Mid-Grade 89 makes any difference in mileage or performance.

What MPG are other V8 4x4's getting with mostly city driving in the real world?
Hey, Dan. I live in the 7th largest city in the US and city driving in my 4X4 HEMI averages 13.5 mpg. The city driving I do is in the most congested part of the city and is calculated from fill-up to fill-up, not by the EVIC, using 10% ethanol gasoline. HTH.
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Old 07-14-2014, 11:27 PM
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Re: Should I use REC 90 gas in my V8?

Quote:
Originally Posted by Angler View Post
Hey, Dan. I live in the 7th largest city in the US and city driving in my 4X4 HEMI averages 13.5 mpg. The city driving I do is in the most congested part of the city and is calculated from fill-up to fill-up, not by the EVIC, using 10% ethanol gasoline. HTH.
Trust me, I wouldn't use the EVIC to calculate gas mileage. FIVE of my GC's through the years have been 4x4 V8's so I know what to expect and this is in line. This driving was mostly in 30-35 MPH areas with a few 45 and 55's (although actual speeds tend to be 5-10 MPH faster) for calculating the 12 MPG. It is what it is...used 35.2 gallons of gas over 422 miles = 12 MPG. I manually calculated it AND also used Gas Cubby app. I even used the SAME gas pump, put the nozzle in the exact same way / distance and set it at the same flow rate for the auto shut-off float to trigger at the same level. Can't get more accurate.

Will see what mid-grade 89 gets under similar driving conditions.

I calculated a 1318 mile trip in my 2005 GC 4x4 V8 with just me and filled with stuff in a move using regular unleaded (didn't use mid-grade) during the summer a few years back and got 16.2 MPG on the highway. Note, the GC was full of stuff and I drove at an average of 74 MPH for the just under 18 hours of actual driving time.
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