What works real well is an additional spring on the accelerator linkage...set up so that you can feel extra resistance near the throttle position that you typically need to hold speed at say 55 mph. Acts much like using a vac gauge..except that you don't need to watch it. You can easily overide the spring when needed. Just has to be done right so there is no chance of your accel pedal sticking.
A block of soft rubber might work also.
Advantages? It works and doesn't cost a lot. Cost effective.
You naturally develop the habit of driving for mpg.
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