Why does chevron gas cost more

While any type of unleaded fuel can be used in Porsche models, the automaker strongly recommends using premium fuel, as each Porsche vehicle has been engineered to provide optimal performance when running on premium unleaded fuel. Regular-grade fuel will have an octane rating between 85 and 87; mid-grade will fall between 88 and 90; and, premium will offer an octane rating of Chevron Australia managing director Mark Hatfield said the US company takes its regulatory obligations seriously.

But the Conservation Council of WA urged the state government to impose a harsh penalty on Chevron for the unauthorised release of more than 5 million tonnes of carbon pollution. It said the state should halt gas production at the plant until the carbon injection project is fixed. He said that since it started up, Gorgon has released nearly 50 million tonnes of direct carbon pollution in WA of which only about 10 per cent has been captured by the CCS project.

Chevron advised in July it was working with the WA regulator on how it would make up the shortfall in performance at Gorgon CCS, which is designed to capture up to 4 million tonnes a year of CO2. It has since injected another , tonnes of CO2 into the underground reservoir. The WA environment regulator requires Chevron to release the performance report this time every year. Chevron started studying how to bury CO2 under Barrow Island, where it had an existing oil operation, in to solve the problem of its Gorgon gas field discovery containing 14 per cent CO2.

The eventual plan had a complex series of steps to store the CO2 extracted from the gas before it entered the LNG plant. The CO2 would be first compressed, then piped to wells and injected into a metre thick layer of sandstone two kilometres underground.

The cavities in the sandstone were full of water, so about four kilometres from the injection wells a second set of wells would bring water to the surface to stop excess pressure building up in the sandstone. This water was then reinjected underground by a third group of wells into a layer of rock above the sandstone.

When the system was started, Chevron found that excess water mixed with the carbon dioxide threatened to corrode the equipment, and major modifications were required.

However, the wells to move the water from the sandstone layer were not used as they would clog with sand. Chevron adds something called Techron to their gasoline , which it claims leads to a cleaner engine, better performance, and maximum fuel economy. Arco stops short of a patented name, simply telling customers that their fuel's so good that consumers don't need to supplement with over-the-counter additives. But is there any proof these additives do anything? Not really. Engines requiring premium gas are typically the more powerful ones found in sports and luxury vehicles, which are more vulnerable to knocking, so recommended fuels have octane ratings of 91 or higher.

Using premium gas in an engine designed to run on regular doesn't improve performance. Many sports or luxury vehicles get along just fine with regular gasoline as well, they wrote. If the owner's manual says premium gas is required , go ahead and splurge. If it's only recommended , ordinary gas is fine. It should be noted that Click and Clack agreed. In the end, then, the decision to buy more expensive gas can be broken into normal reasoning repetition; if you have a good relationship with the owner and the usual brand vs.

If that slightly more expensive station is the one on your route, or if you like the smell of their window washing fluid, a few extra pennies per gallon may be worth it for you. California desert town takes back the night, wins rare "Dark Sky" award. The U.