Sea Foam for poor gas mileage [SOLVED]

Hi! I bought an 03 Cavalier from my dad a few months ago. He didn’t drive it often as it only had 42,000 on it (yes just 42k). Recently it has started to get poor gas mileage – I’m talking at least 80 less miles per tank in the same repeated driving routine. Would putting this Sea Foam Motor Treatment product in the tank be the way to start working on what’s going on? Thanks for any positive feedback!

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Jim D.
Jim D.
1 year ago

Thanks for the question, Chris!

Here’s what I’d do: even though the Cavalier does not have “high mileage,” I’d add a full can of Sea Foam High Mileage to a low tank of fuel (1/8 tank or so) and drive it until almost empty before refueling. That will start cleaning up residues and deposits that may be contributing to the poor gas mileage. If the poor mileage is caused by this, the Sea Foam will help. (Regardless, it will do a great job cleaning things up and helping the engine run better). It may take a couple treatments like this before noticing any difference.

For a good cleaning concentration, add a full can of Sea Foam to 1-2 gallons of fuel. Run it until almost empty before refueling. That will allow the high concentration of Sea Foam to work through the fuel system and give everything a good cleaning.

Also, it is just as important to pay attention to routine maintenance items as well. Spark plugs, fuel filter, air filter as well as fuel system maintenance. Even though the vehicle only has 42K, these items could need attention as well.