Buick Lesabre Engine Poor Mileage

My Car Sounds Like Its Running In Low Gear, At A High Speed, Yet The Rpms Are Not Raised Up. Since It Has Been Running Like This, My Gas...

Only 14.5 Mpg Currently Have Noticed Some Hesitation And On Freeway Sometime On The Inclined Its Sutters Pretty Good

Currently Getting Only 14.5 Mpg In Town And I Am A Very Light On The Pedal Driver Sometimes I Notice Some Slight Hesitations And Just...

My Car Has Been Getting 30 Or 31 Mpg On The Road But The Last Two Trips I Have Only Gotten 24 Mpg. Do You Have Any Suggestions Why? There...