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Fuel mileage difference using higher octane

any difference

Re: Fuel mileage difference using higher octane

Postby aksierra11 » Feb 26 2012, 9:32pm

starspangled6.0 wrote:Back to the original question:

I drove a lot this fall using only 91 octane, since that's what my programmer was tuning the truck for. It was a nice kick in the pants, but did nothing for fuel economy.

The main reason for running higher octane is you can run more timing without the motor pinging. If tuned right and you keep out of it you will see a MPG increase but nothing worth writing home about.

I know with a K&N filter, home made tube, free flowing muffler and the custom tune if I was really nice to it I could break 20mpg with my 6.2
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Re: Fuel mileage difference using higher octane

Postby starspangled6.0 » Feb 26 2012, 9:37pm

Well, it was only a canned tuner (Hypertech). I most definitely noticed a power bump from 87 tune to 91 tune, but the fuel costs never got recouped. The power was worth the extra $0.20\gallon, though :twisted:.
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Re: Fuel mileage difference using higher octane

Postby aksierra11 » Feb 26 2012, 9:43pm

no one argues with more power lol
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Re: Fuel mileage difference using higher octane

Postby pblakey » Feb 27 2012, 9:27am

Ditto on the power! Just installed my hypertech today and drove to work. Man it really hauls now! Really got to watch my heavy foot now. will have to keep it below 2000 rpm and use cruise control more. Was it worth the power bump????? YES, Yes it was!!
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Re: Fuel mileage difference using higher octane

Postby longears » Feb 28 2012, 1:38am

So,Since our newer trucks can mostly use e-85 and the octane level on e-85 is like 115 and regular fuel is 87. Apparently our engine computer can tell between the two, So why wouldnt it be able to tell if you were running 91 octane. :?: Furthermore, I was thinking that Gm should start putting v4-v6-v8 selector switches in trucks. when im going stop and go in citys, i dont really need to get going in a huury. If i did need romp on it i could select v8 mode. :evil: Or if you are towing or hauling something. Most of the time my afm kicks in its an annoyance. Im really hoping that gm comes out with something that beats fords asses in hp and mileage. I am so tired of hearing about the ecoboost crap. Really gm had direct injection long ago. Also gmc had the turbo typhoon 4.3 liter v6. So im betting on gm laying waste to the other truck manufacturers. :twisted: Sorry soo long. :evil:
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Re: Fuel mileage difference using higher octane

Postby lash » Feb 28 2012, 5:16pm

Well, if you have a recent 1500 with V6 or V8, it's likely that you already have active fuel management and maybe don't even know it. I know my 5.3L has it, which is why, I can sometimes rack up as much as 21 mpg when I'm traveling highway and can keep the heavy foot deactivated.

For those of you not familiar with active fuel management, here's a quick article:
http://en.wikipedia.org/wiki/Active_Fuel_Management

In other words, your truck may already be shutting down 4 cylinders while cruising and you can't even tell. :shock:
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Re: Fuel mileage difference using higher octane

Postby EKinMN » Feb 29 2012, 4:56am

I have not been able to measure a difference in fuel economy when I have run mid grade gas. Only difference is a slightly smoother transition when it goes in and out of 4 cyl....I think.

In other words, not worth the extra $.10 per gallon.
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Re: Fuel mileage difference using higher octane

Postby red matter [OP] » Feb 29 2012, 11:25pm

Well I taken some advice from this thread and have been keeping the rpm's around 2000 when taking off from stop lights and stop signs.Also I change my route to work as well,mostly 45-50-55 mph speed zones with vary grades to the roadway. i topped it off last sunday with 91 octane, mid grade 89 was .5$ cheaper than 91. So far this week driving to work I have picked up 2mpg more than in the past barreling down the highway at 65mph. Crappy weather here in NY. In the 40's one day and the next it's in the 20-30's range.Not sure the octane had anything to do with it, more than likely my driving habits. averaging 18.2 to 18.6 mpg. My truck has a 5.3 six speed, regular cab with 3.42 gears.
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Re: Fuel mileage difference using higher octane

Postby asimon12 » May 10 2012, 12:48am

Ran pure E-85 on a 2008 F**d E-350 15 passenger van, 10mpg never better with good driving habbits. FYI
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