Want to really save gas?
- Make sure your tires are properly inflated.
- Make sure your air filter is clean.
- Make sure your O2 sensors are working.
And most importantly…
4. Stop driving like an asshole.
Do all those and you’ll more than likely see 20-30% in fuel savings. Oh, but wait, that requires actual change on your part, not some miracle additive/boycott/hardware, so that will never work.