Ethanol mix in regular gasoline, hence called Gasohol, varies usually from the more conservative E5 (5% ethanol) up to E25 (25% ethanol, available regularly in Brazil, not even during the entire year, with limited availability in Paraguay too). Since there is not too much lubricity neither in gasoline or ethanol, they are not recommended to be constantly used in a diesel engine, pero sa emergency is acceptable. To avoid damages to the injection pump, considering a mechanical injection (assuming CRDi engines doesn't tollerate gasoline since electronic modules don't provide an injection tuning pattern for it), supplementary lube blend into fuel is extremely recommended, like it's done in a 2-stroke spark-ignited engine.
Ethanol has presented greater results in compression-ignition engines than gasoline, and is widely used in Sweden to power urban transit buses.
Direct injection is a must while operating ethanol in a diesel engine, since its higher volatility would lead to pre-ignition inside prechambers in an IDI.
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