Ethanol-free gas database: http://pure-gas.org/index.jsp
Older engines have trouble running on gas with ethanol, and as ethanol is hygroscopic, it enables rust.

Check prices online:

  • fuel up in the morning (fuel is denser).
  • If fuel truck is filling tank, skip and go elsewhere: it will still debris from the bottom.

Fuel efficiency

  • each 5mph you go over 60mph is equivalent to paying 10 cents more per gallon.
  • clean air filter can improve your fuel economy up to 10%.

Diesel is designed for long hauls with highway speed, not for every-other-day short trips.

Diesel engines - When storing van/RV, have tanks almost full to cut on condensation in fuel tanks. Diesel also can get algae growing there, more so with new low-sulfur diesels. Also, station with low fuel turnover may have algies.

A shade-tree mechanic's trick to de-carbonize an engine: Warm up the engine to operating temps then run at a very fast idle while slowly trickling water into the intake. Increase the rate of water until the engine starts to stall then stop until it recovers and is running smoothly again. Do this four or five times then go for a road test.

This procedure is relatively simple for a carbureted engine but should also be doable for an engine with EFI with some thought.

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