 The 95.3 MNC Gas Gauge. Mishawaka's Marathon on East Jefferson is $3.35 a gallon. It's $3.16 in Elkhart at the Marathon on West Franklin. In Plymouth, the Murphy OSA on North Oak is at $3.46. $3.59 in Bristol at the Bristol Food Mart on West Pistula. And if you head to the beach in New Buffalo, you'll find gas for $3.69 a gallon at the Craft Station on West Buffalo.