1993 Chevrolet Corvette Owner's Manual - Page 242

Fael Use premium ,unleadedgasoherated at 91 octane higher, You may use middle grade or rcgultir unleaded gasolines, but-your vehicle may not accelerate as well. The gasoline you use should meet specifications ASTM D4814 inthe US. and CGSB 3-5-92 in Canada. These fuels shouldhave the proper additives, so you should not have to add-mything'tothe fuel. In the US.and Canada,it's easy to be sure.you getthe right lrind of gasoline (unleaded).You'll see "UNLEADED" right QII the pump. And-onlyunleaded nozzles wl fit into your vehicle's filler i l neck. Be sure the posted-octanefor premium is at least 91 (at leatit 89 €or middlegrade and 87 for regular). I the octane f is less than 87, yuu may get a heavy knocking nu& when you drive. I€.it's bad enough,it can damage YOLK engine. If you're usingfuel rated at 9 octane or 1 higher and you still hearheavy knocking, your engine needs service. But don'tw q if you hear a little pinging noisewhen you're accelerating or driving upa hill. That's normal and you don't have to buy a higher .octane fuel to get rid of pinging. It's the heavy, constant knock that means you have a problem. Fuel Capacity: 20 U. S. Gallons (75.7 L) . Use unleaded h e 1 only. 24 I ...