mpg help
Dirty Rotten Scoundrel
Joined: Aug 2009
Posts: 177
Likes: 2
From: Simpsonville, SC
I think it's time for a tune up northstar, or cut out the burn-outs at every light 
OK, I take this post as permission to go get the lift and the 35's I've been avoiding due to fear of the tree-huggers.
OK, I take this post as permission to go get the lift and the 35's I've been avoiding due to fear of the tree-huggers.
Junior Member
Joined: Dec 2009
Posts: 9
Likes: 0
Dirty Rotten Scoundrel
Joined: Aug 2009
Posts: 177
Likes: 2
From: Simpsonville, SC
Northstar:
Dirty plugs would only effect fuel economy by 10-15% at most. You are down about 30% from normal, so I'd think it could be more serious. I'd still do everything that's cheaper first. Good fuel, new air filter, tire pressures, clean the throttle body. Then go to the shop for plugs, diagnostics, and maybe alignment. Could be a MAF or O2 sensor? Dirty injectors? Or maybe try driving only down the hills instead of up them.
Dirty plugs would only effect fuel economy by 10-15% at most. You are down about 30% from normal, so I'd think it could be more serious. I'd still do everything that's cheaper first. Good fuel, new air filter, tire pressures, clean the throttle body. Then go to the shop for plugs, diagnostics, and maybe alignment. Could be a MAF or O2 sensor? Dirty injectors? Or maybe try driving only down the hills instead of up them.
Last edited by Ruprecht; Dec 27, 2009 at 05:10 PM.
Things are looking up!
Joined: May 2009
Posts: 193
Likes: 0
From: Richmond, VA
Well its the regearing that has really helped my mpg's. Without them, I think I would be lucky to get 10mpg. Its not cheap to change them but worth it in the long run...more mpg's plus easier on the engine and transmission!
Junior Member
Joined: Feb 2009
Posts: 5
Likes: 0
I took a friends advice and tried ethanol free gas for a while (10 fill-ups). I was averaging probably around 14 mpg. I just decided to go switch stations (10% ethanol) and on the first fill-up I got 15.6 mpg. Not great, but an improvement.
I've been running a K&N filter since early on.
I've been running a K&N filter since early on.
Junior Member
Joined: Dec 2009
Posts: 9
Likes: 0
Northstar:
Dirty plugs would only effect fuel economy by 10-15% at most. You are down about 30% from normal, so I'd think it could be more serious. I'd still do everything that's cheaper first. Good fuel, new air filter, tire pressures, clean the throttle body. Then go to the shop for plugs, diagnostics, and maybe alignment. Could be a MAF or O2 sensor? Dirty injectors? Or maybe try driving only down the hills instead of up them.
Dirty plugs would only effect fuel economy by 10-15% at most. You are down about 30% from normal, so I'd think it could be more serious. I'd still do everything that's cheaper first. Good fuel, new air filter, tire pressures, clean the throttle body. Then go to the shop for plugs, diagnostics, and maybe alignment. Could be a MAF or O2 sensor? Dirty injectors? Or maybe try driving only down the hills instead of up them.