Performance Difference Between 91 and 93 Octane Fuel
 

I do notice a small difference in engine performance between the 91 octane that I normally put in my 2019 370Z with 12,000 miles and a 93 octane mixture from Sunoco SS 100 race gas and 91 octane pump gas. When I run the 93 octane blended mixture I notice that the engine idles a little more smoothly and more quietly and pulls a little more strongly from a start. With the 91 octane I sometimes get a little pinging and hesitation from a start if I don't feather the clutch correctly, none of that with the 93 octane. The most objective difference that I notice is in my longer term gas mileage indicator, where I get about a 2 mpg increase in mileage with the higher octane. The Sunoco race gas is hard to get here in Northern California and it is expensive, so I normally don't use it. My car's engine and exhaust system are still stock;)

I get Sunoco 93 right out of the pump here in Pa. :tup:

Remember when Sunoco had custom blending at the pump ? You could go from 190 economy to 260 which was two notches above their 240 which was premium . You could select anything in between in increments of 10

Yup, I also remember static timing, points and condensers! :eek:

Octane is not that big of a deal since the ECU made its way into cars.

Oh yeah; the good ol days when GTOs, Roadrunners, Z28s and 442s roamed the streets.

Noop, I remember fuel for under 50ct. a gallon. Self serve pumps just started being installed. Most of them were still full service. Getting the oil checked, added, etc. Front window washed.

That was my first paying job ( except for paper boy ) pumping gas at a full service Sunoco station. The economy grade 190 was going for 19.9ct. a gallon in 1972

My first job was for Boron Oil at a gas station. I remember standing guard at the pumps with a shotgun during the 1973 gas crisis. Had cars lined up around 2 blocks. :rofl2: My gas tank was always full. :tup: