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05-15-2013, 07:52 PM #31Ray
'09 Avalanche LTZ - Black
'05 Envoy XL (sold)
05-16-2013, 07:45 AM #32
I've noted this...
The 2012 runs fine on 87 in the summer, except it seems to surge at really low RPM (like just before the trans downshifts). Running 89 in the summer eliminates the low RPM surging. I see absolutely no difference in mileage. It runs fine on 87 in the winter, so I attribute it to winter/summer blend gasolines. My game plan is to run 87 when the truck is a grocery getter, and run 89 when I intend to tow anything.
Now in my old POS Subaru Outback, if I run 87 it gets about 22mpg and runs blah, but it I run 89 it gets about 25mpg and feels better. The difference in the cost is probably a wash since the more expense 89 nets me better mileage.
- - - Updated - - -
In my last truck, a 2004.5 Dodge Cummins, 2500, 4wd, 4.10s...with a great tail wind (probably in excess of 55mph sustained at times), I netted back to back tanks heading west across the northern tier (ie. North Dakota, et al) of over 28mpg hand calculated. On the return trip, I netted a best of 16mpg bucking a similar wind. Having that tailwind was kind of cool...when it matched the trucks speed, things get really quiet because all the wind noise stops! I had a system down on that truck, so that I "filled up" the same each and every time...I was within an ounce or two each time, so I know my hand calc'd number were dead on.
While gasoline quality can affect mileage (diesel fuel too), there are too many variables for a "one tank" comparison. Even going from winter blend to summer blend makes my mileage change...same brand fuel, same grade of gas, drastically different mileages.
05-21-2013, 10:17 PM #33
- Join Date
- Dec 2004
- Arlington, Texas, United States
- Blog Entries
87 Octane here, and I'll run some RXP additive through about every 5th tankfull or so to keep everything cleaned out.
10 Chevy Traverse LT AWD
02 Chevy Trailblazer LS (110K+ miles - loaded except for 4WD - WRECKED!)
99 Chevy Cavalier LS (105K+ miles - commuter car)
78 Chevy Suburban Silverado (454, 3/4 ton)
62 GMC 3/4 ton Pickup (350 police interceptor)
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05-26-2013, 12:56 PM #34
- Join Date
- Mar 2011
- Central PA
Ethanol free 91 octane. Oh yes, $3.99/gallon vs $3.49 for 87 ethanol or $3.89 for 92 ethanol fuel. I average maybe 12 mpg on 92 octane ethanol fuel. I found a few places with ethanol free fuel, happens to be 91 octane. I average over 14 mpg so far. Go ahead, calculate it. I am actually saving money. I've heard of 8 mpg better with some vehicles. My 6.0l in the Burb runs smother and a hair more power.
Ethanol free gas lasts longer (chain saw, lawn mower). Stuff that sits for periods of time. I replaced a $40 fuel pump in lawn tractor due to ethanol eating diaphram and fuel lines. This stuff is junk.
I'm sticking with what I found, it works. Good luck to those 87 ethanol people. Sorry2003 Suburban 2500 LT, 6.0l Volant cai. 3.73 gear. Mobil 1 syn oil
05-28-2013, 12:31 PM #35
As far as 91 or better octane being the holy grail, I have ran a couple of tanks of 93 in my Silverado with virtually no difference in fuel economy. So for me, running premium fuel would be a waste of time and money.
2013 Silverado LTZ White Diamond Crew Cab
Advent OGM1 Navigation
Husky Liners GearBox Underseat Storage
EGR Rail Caps
K&N Air Filter
Flowsound 40 Muffler
Hypertech Max Energy Tune (only top end limiter removed and AFM disabled)
Chrome Tailgate Handle Cover
TonnoPro HF-155 Tonneau Cover
WeatherTech Front and Rear Splash Guards
Husky Liners X-Act Contour Floor Liners
WeatherTech Side Window Deflectors
06-04-2013, 11:09 PM #36
- Join Date
- Jun 2013
- 1391 N Jefferson St., Anaheim CA 92807
octane gas is a standard measure of the performance of a motor or aviation fuel.octane is available in various form RON(Research Octane Number ),MON(Motor Octane Number) is a better measure of how the fuel behaves when under load, as it is determined at 900 rpm engine speed, instead of the 600 rpm for RON.Use of gasoline with lower octane numbers may lead to the problem of engine knocking.so AKI is a mixture of RON & MON helps to remove the knocking problem.
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