I had a post awhile earlier about a redistributed FE goal... Rather than just hit a target FE - hit a date before fill up. If you pick one far out enough, you'll work hard to conserve fuel while using it - and seek out alternative transportation not to use it.... Self rationing.
Alas, I missed my goal by 1 day... A friend of mine bike a bike chain about 8 miles from home. So it was an "emergency" of sorts, and I picked him up and threw the bike on the rack
But, it's a personal best on tank mileage
It doesn't work so very well starting from a full tank though
It's hard to predict a target fill up date when where you go changes, frequently.