Gas Milage


Asked by Mar 14, 2011 at 04:29 PM about the 1997 Plymouth Grand Voyager 3 Dr SE Passenger Van Extended

Question type: Maintenance & Repair

My Gas milage has gone from 23-25 on the hwy.(back when the van had 80,000miles)
I now get 17-19 miles to the gallon on the hwy. (175,000miles on the van)

It has top of the line sparkplugs and wires 10,000 miles ago.
What do i need to do to get the milage back up ?????
thanks to any one who knows......Al

2 Answers


this could be a number of problems. could have a plugged cat. O2 sensor going bad but not to the point where its sending a check engine code. bad fuel injectors possibly?


Thank you i cleaned the valve body when i put new plugs in & i have used the lucas injector cleaner 2 containers so far. i did not think or know of the O2 sensor problem, does that work ? what is the function of the O2 sensor....thanks for the help have you ever heard of the gas milage getting this bad ???

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