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Fuel grade type in an 87 305.
#755027 December 19th 2019 4:16 am
Joined: Sep 2015
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journeyman
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87 G20 305 with a TBI stock.

What grade of gas is recommended? I get different answers when I ask different people and when I read online. And no two answers are ever the same about why I should run that particular a grade. Thanks.

Re: Fuel grade type in an 87 305.
chevydude1987 #755028 December 19th 2019 9:29 am
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I am as much of an advocate of premium gas as anyone for most cars, but there is literally no reason to use it in your van. The 305 isn't high compression and there is no other reason to use premium in it.

Granted my 85 is carb, but it actually runs better on 87/89 than it does on 93 octane. Mileage was the exact same too.


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Re: Fuel grade type in an 87 305.
chevydude1987 #755029 December 19th 2019 11:54 am
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I have several older Chevy Blazers, all with the 350 in them, and run 89 octane in all of them. A couple times I thought I would save a few cents and put 87 in, and developed a small miss or chug. I worked at a repair garage back in the 1990's and folks would come in and say their vehicle had developed a miss or was hard starting. We would always ask them where they had purchased gas and what octane, almost always they had got the cheapest gas in the area with lowest octane rating. We would tell them to drive the car and run the tank low and fill back up with a higher octane, usually solved the problem. The Unimarts in my area were notorious for cheap and bad gas and still are.

Re: Fuel grade type in an 87 305.
chevydude1987 #755030 December 19th 2019 12:21 pm
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Always buy Top Tier gasoline. Not all stations are. Top Tier has additives that help. Buy gas at Quik Trip in thIs part of country or any station that has the green Top Tier symbol. I've used nothing but ethanol in all my cars since that stuff came out.
When I'm where they don't sell it in other parts of the country I buy reg. Not a dimes worth of difference in running or milige.
Just look for the Top Tier logo.


[IMG]A foolish faith in authority is the worst enemy of truth. Question Authority.

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