Originally Posted By: Rickey
They are not saying that high sulfur and ethanol content etc. are a requirement for top tier at the pump.
Agreed. It is amazing how many conversations over the last half-decade have occurred on BITOG with people thinking that Top Tier requires ethanol. And yet, every few months, someone pops back up on here stating that it does, and the conversation starts all over again. As an antidote, I live in Iowa, where ethanol is king. In spite of this, at almost EVERY gas station in this state, the ONLY grade with ethanol is mid-grade (pump labeling is required in Iowa). The top-grade and the low-grade almost never contain ethanol. This is true even at all the Top-Tier fuel branded gas stations. Does that mean that only the mid-grade fuels in Iowa are Top Tier? Definitely not. For example:
Originally Posted By: KeithKman
Question, why can you get 93 back east, south, and on the east coast, but can only get 91 out here west?
Because usually you're at a higher altitude out west. When at a higher altitude, the fuel is less volatile because of less oxygen. So 93 octane out east has a pretty close volatility to 91 out west.
Originally Posted By: KeithKman
Question, why can you get 93 back east, south, and on the east coast, but can only get 91 out here west?
Higher altitude = thinner air = less "effective" compression ratio.
If you are running a turbo that is under ECM control then it is a different situation.
Most ECM's will automatically turn up the turbo at high altitudes to keep performance consistent.
