GMC ENGINE POOR MILEAGE

Our 97 Jimmy Has Had A Few Problems In The Last 6 Months. We Have Changed Oil & Filter, Put On New Rotor & Cap, Coil & Ignition Control...

Sucking Up Gas Like Crazy.

I Bought This Truck 4 Months Ago And The Fuel Mileage Has Gotten Worse. The Previous Owner, Who Is A Good Friend Got 19-20mpg. I Am Only...

I Have A 1500hd W/ 6.0l. What Would Cause My Mileage To Drop To 8.5-9 Mpg From 10.5-11? I Changed The Plugs, And Went To Synthetic Oil...

All Of The Sudden I Am Getting Ridiculous Fuel Mileage, Fuel Pump And Filter Have Bee N Replaced Also Have You Heard Of Any Recalls On...

I Have A 2006 Impala 3lt V-6 3.6l, I Have Been Told That Full Synthetic Oil Gums Up The Engine?Is That True?Im Comin Close To My First Oil...

I'm Having Problems With Engine Power And Fuel Consumption On My 95 Yukon 5.7l. It Starts Fine. Idles Fine. But When I'm On The Hwy Or Going...

For The Last Few Weeks My Engine Runs At A Higher Than Normal Idle Speed When It's Cold. It Normally Runs At 1000 Rpm When Warming Up;...

I Have A 2003 Gmc Sonoma 4cyl-auto. It Is Underpowered And Gets Poor Gas Mileage For A 4cyl. What Kind Of Improvements Can I Do To The...

Is Fifteen Or Lower Mpg Good Gas Mileage For A First Car?