Hello! Just wanted to share the way I made my car run 50.2 MPG I'm still tuning, so hopefully will get better numbers...
Car: Toyota Tercel 98, manual transmission
Stock (Measured Prior to MODS) Average MPG: 36.7 MPG (mixed, see testing bellow)
Rated: 39 MPG Highway
Modded (Measured after MODS): 50.2 MPG (mixed)
Testing: All testing performed running same daily route which include both city and highway.
MPG calculated from 200-300 miles trips
Using 87 octane regular gas
400 Watt music
A/C always ON (hot weather in Puerto Rico)
Mods:
Only One Wide Mouth Glass Jar $39 (parts)
MAP sensor enhancer $18 (parts)
Disconnected Exhaust Manifold Oxygen sensor
Jar:
3/4 tsp Baking Soda @ 3 amps
No checkvalves and No arrester on a single line for the intake manifold