![]() What is specific gravity of gasoline and why should you care?.What is vapor pressure of gasoline and why should you care?.Lawn and garden equipment needs the proper fuel, too.Picking the proper gas regarding lead and oxygen.Why does E85 run cooler and make more power?.What separates a race fuel from a street fuel?.What's in aftermarket additives anyway?.What's the right fuel for forced-induction cars?.Does the octane number in your manual match the one on the pump?.Homebrewed, non-ethanol fuel: A potentially deadly DIY.Gasoline makes a terrific degreaser, yet this practice can kill you.Water is great for your plants, not so much for your fuel system.Can you blend fuels to get the right mix?. ![]() How much octane is enough for my classic?.The right fuel in the fall might help your engine start in the spring.(And for those living in states that follow CARB regulations, Sunoco offers the similar SS 100.) Top Tier fuels, like Sunoco’s pump products, contain more detergents than the minimum level, while Sunoco 260 GT is an unleaded, 100-octane product that can be blended with pump fuel to produce the desired octane. “Detergents help the engine remain like it was new, while antioxidants help fight the formation of gums and varnish,” Santner says, adding that minimum detergent requirements started in 1996 due to an EPA mandate.Īnd if you’re looking to go above the minimum, Santner offers some advice. Modern gasoline also contains better additives than fuel from the past. Today’s oxygenates, such as ethanol, help boost octane ratings without the use of lead. Removing lead while reducing the sulfur and benzene content allows modern fuels to be less hazardous for humans and the environment. While such high octanes may no longer be offered at the corner station–the lead that easily added octane was removed from street fuels long ago due to its dangerous effects on human health–Santner argues that today’s fuels are actually a better product. Sunoco 190, the economy-grade fuel, sported an octane rating of 87, while 260 checked in at 97.5. If you’d ordered the high-performance V8, Sunoco said to consider Sunoco 250, billed as a super-grade fuel.īut what about octane numbers? As explained by Zachary Santner, senior quality specialist at Sunoco, stations didn’t have to post octane ratings until September 1973. If you had a 1967 Camaro with the inline-six or standard V8, for example, Sunoco recommended 200, a regular-grade product. Not sure how much octane you needed? Sunoco stations offered a chart that provided recommendations based on year, model and engine. Eight grades were offered, ranging from Sunoco 190 all the way to Sunoco 260, billed as the highest-octane fuel available–one good enough for championship driver Mark Donohue. Sunoco even operated its Custom-Blended pumps from 1958 through 1972, allowing customers to choose the octane their engine needed. It had higher octane, the lead craved by the day’s engines, and a smell that meant business. Back in the day, pump fuel was just meaner.
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