Quote:
Originally Posted by Rose
I own a VW, most of which require premium, but we decided to see if we could safely run on the plus. If that works out, we may try regular.
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Modern engines have anti-knock provisions built into their control systems, so probably "safety" isn't a factor if you have a relatively new car. This is usually achieved by dynamically de-tuning the engine while under load by increasing the fuel-air mixture and retarding the spark. In plain English, if you are using maximum power with a lower octane gas, the engine will simply produce less horsepower to compensate for the lower octane. Usually, though, we don't drive at maximum load, so the lower octane probably wouldn't make any difference at all.