yrraljguthrie
Senior Member
- Joined
- Jun 30, 2023
- Posts
- 164
- Reaction score
- 178
- Location
- Sulphur, Oklahoma
- Ram Year
- 2023
- Engine
- etorque5.7
This is more of an information post than a discussion. Hope that is ok? These are not my opinions I am merely repeating known attributes.
Today I discovered gasoline nationwide wholesale costs an average of $2.80 and the national average for retail sale sales is $3.65. Those gasoline retailers are making $.80 per gallon.
87 octane is 87 percent gasoline and 13 percent n-heptane. 89 is 89 percent gasoline and 11 percent n-heptane. This means there is virtually no difference in the cost to produce the various grades.
The n-heptane is to control or regulate the knocking, which today's engine computers can detect and adapt to, which reduces the performance of the engine somewhat.
The difference in performance is only evident at the very top end of the performance. Likely never seen by most drivers.
There can be little to no difference in fuel economy between the various grades, and there is not according to controlled tests. There is a difference when ethanol is mixed in.
Since all gasoline costs about the same to manufacture I wonder who pockets the difference between 87 and 92 octane? Could be $.40 to $.80 per gallon.
I'm never buying anything other than 87 again. Although I would prefer ethanol free. That is a definite difference in mpg and performance.
And my opinion is that RAM is telling us to use 89 so they can advertise 395 hp and 410 foot-pounds of torque instead of a small amount less. I'll settle for say 375 and 400.
Today I discovered gasoline nationwide wholesale costs an average of $2.80 and the national average for retail sale sales is $3.65. Those gasoline retailers are making $.80 per gallon.
87 octane is 87 percent gasoline and 13 percent n-heptane. 89 is 89 percent gasoline and 11 percent n-heptane. This means there is virtually no difference in the cost to produce the various grades.
The n-heptane is to control or regulate the knocking, which today's engine computers can detect and adapt to, which reduces the performance of the engine somewhat.
The difference in performance is only evident at the very top end of the performance. Likely never seen by most drivers.
There can be little to no difference in fuel economy between the various grades, and there is not according to controlled tests. There is a difference when ethanol is mixed in.
Since all gasoline costs about the same to manufacture I wonder who pockets the difference between 87 and 92 octane? Could be $.40 to $.80 per gallon.
I'm never buying anything other than 87 again. Although I would prefer ethanol free. That is a definite difference in mpg and performance.
And my opinion is that RAM is telling us to use 89 so they can advertise 395 hp and 410 foot-pounds of torque instead of a small amount less. I'll settle for say 375 and 400.