Got impala ss around 1k miles ago at 98k, had vacuum leak and cat converter replaced. Check engine light has not come back on for a few hundred miles but still getting terrible gas mileage. Like 180 to a full tank of gas a full 100 miles below what my digital readout says to expect. Have done plugs and wires, fluids and gas treatments. Any ideas what it could be?
have the same problem?
Friday, October 31st, 2014 AT 6:04 PM