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I don't think it will be much different, but I thought ethanol burns a little faster than ethanol-free gas, but I could be wrong. I have always run 87 octane unleaded ethanol-free gas, don't want that ethanol crap in my truck.
Yes ! Highly recommended. I have a 94 Suburban 4x4 with 5.7 and only use non-lethal high test and get 17-18 mpg and better performance, especially off road in soft sand.JakeWondering if it would hurt anyting to try ethonal free gas in my 99 obs burb with a 5.7 vortec. It has 188k and found out that a local gas station has it instead of the 10% ethonal blend. Is there a big difference or will i notice anything like better mpgs? Not that mpgs matter in a burb lol.
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Im not sure what vehicles youve had that reccomended premium but my sister in laws audi pings and doesnt run worth a crap on 87. It reccomends 91 or higher. Trust me, i fought with it for a solid couple weeks before i found that sticker and asked what fuel she put in it. Chances are if the manufacturer reccomends it, there is a reason.Ethanol free is suggested for engines that don't run very often. Like motorcycles & small engines, like generators, etc. I could buy it, but the cost is not worth the slight difference?
Regular gas is always fresh at the pump, due to the high turn-around, filling the station tanks. ( As tuners say).... The best fuel for an engine is an octane that is "just short" of engine ping. If you don't ping using regular grade, use it. Manufacturers labeling "use premium" on the filler door is a joke. Changing from premium to a lower grade, and you don't ping is the better grade.
( suggestions are from some NHRA drag racing tuners & a motorcycle race engine tuner)
Im not sure what vehicles youve had that reccomended premium but my sister in laws audi pings and doesnt run worth a crap on 87. It reccomends 91 or higher. Trust me, i fought with it for a solid couple weeks before i found that sticker and asked what fuel she put in it. Chances are if the manufacturer reccomends it, there is a reason.
So am i doing more harm by running 91 octane thats a 10%corn blend than running the lower grade 5% blend?i was told regular 87 or 85 octane is for mowers and old cars that i should only run 91 or 93 octane especally in a v8 engine. Since its a 42 gal tank and we travle quite often it rarley gets the same octane all the time except in town. And even then when prices go up i switch to the lower priced gas to keep costs about the same. Im getting to the end of this tank just have to make it to thurs then i can throw 10 in till friday and ill fill it up with the ethnol free and do new plugs and wires.
Lol dont laugh at me for this but i have no idea what pinging sounds like. Ima have to google it lol. My suburban is unmodified except for removing the cats and a KnN filter. I might be doing headers and full exhaust but thats it.I agree with this. Also, jumping down levels in gas until you hear audible pinging probably isn't the best process. Data logging what the knock sensors are picking up would really be the way to check.
That said, if were talking about a low compression engine running a stock timing map, 87 is probably all it needs.
Lol dont laugh at me for this but i have no idea what pinging sounds like. Ima have to google it lol. My suburban is unmodified except for removing the cats and a KnN filter. I might be doing headers and full exhaust but thats it.
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