what gas do you use?
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Senior User
Joined: Jul 2011
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what gas do you use?
what would you reccommend i use for gas, 87, 89, or 91? my truck has a 400 with an edelbrock intake carb and air cleaner and an RV cam. thanks! also, i live in the middle of nowhere and the nearest place with 91 is 55 miles away so i usually use 89
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
2x with Devino246. 87 octane and yer good. Anything higher is just a waste of money.
Not til 10:1 or higher compression would you need to consider higher octane gasoline. Even then, vehicles today have knock sensors and can dial back the timing in cases of detonation (or a bad tank of gas).
Not til 10:1 or higher compression would you need to consider higher octane gasoline. Even then, vehicles today have knock sensors and can dial back the timing in cases of detonation (or a bad tank of gas).
Hotshot
Joined: Feb 2004
Posts: 10,808
Likes: 2,604
From: The Shenandoah Valley
I use 87 octane BP with Invigorate in all my 5 Fords (one of which is very much the same as yours), 1 Subaru, 2 Gold Wings and my Wheelhorse Tractor / SnowBlower / Tiller.
I use high test gas with NO alcohol in my '74 Triumph T150V Trident.
I use high test gas with NO alcohol in my '74 Triumph T150V Trident.
Fleet Mechanic
Joined: Sep 2009
Posts: 1,572
Likes: 37
From: Northern Virginia.
i usually run 91 to 93 in my truck. depends what they have at the place i stop.
i usually try to go to the busier places. i feel the gas is better due to higher sales.
it probably does not make a diference. i honestly never thought 87 would be good for
these old engines. but i will probably start to use 87 since so many do. i just want the
truck to last.
i usually try to go to the busier places. i feel the gas is better due to higher sales.
it probably does not make a diference. i honestly never thought 87 would be good for
these old engines. but i will probably start to use 87 since so many do. i just want the
truck to last.
Junior User
Joined: Feb 2008
Posts: 82
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The octane rating has nothing to do with the "quality" of the gas. If you want the freshest gas you can get then 87 from a popular store is what you want. People buy less of the higher octanes so there is more time between those tanks getting filled with new gas.
Also, higher octane fuels actually burn slower than lower octane. Unless your engine has higher compression and requires a higher octane fuel then you are making less power with 93 over 87 octane. Google it if you don't believe me.
Also, higher octane fuels actually burn slower than lower octane. Unless your engine has higher compression and requires a higher octane fuel then you are making less power with 93 over 87 octane. Google it if you don't believe me.
Fleet Mechanic
Joined: Jun 2007
Posts: 1,931
Likes: 2
From: Ohio
I've ran 87 n my 390 pretty much the whole time i've had the truck. I do use 89 every now and then, considering i hear from a lot of guys sayin that today's gas is crap compared to years ago. I put in 1.5 gallons of 93 last week for the hell of it and now it takes a while for my truck to start. So i won't be doing that anymore.
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