Horrible MPG on GT
03-26-2014, 03:41 PM
#21
Thread Starter
Join Date: Mar 2014
Location: RI
Posts: 10
Before doing ANY mechanical work/replacements, ALWAYS ALWAYS be sure your data that's telling you that there's a problem is accurate. You imply that the data is accurate because the previous owner told you so. Really???
Get hold of a GPS, get out on the highway and confirm both the speedometer and the odometer, THEN start spending time and money AFTER the data is known to be accurate.
Kids these days...
Get hold of a GPS, get out on the highway and confirm both the speedometer and the odometer, THEN start spending time and money AFTER the data is known to be accurate.
Kids these days...
Sometimes I do notice a gas smell but not often.
03-26-2014, 08:15 PM
#23
5th Gear Member
Join Date: Sep 2010
Location: IN
Posts: 2,248
03-27-2014, 07:26 AM
#24
6th Gear Member
Yeah, it's beginning to sound like an engine or driveline issue. If you were to fill up, reset the onboard at the gas station then immediately get on the highway with the cruise control set at the speedlimit, then cruised for about 100-200 miles, the onboard should be reading at a minimum 22-24 MPG. Driveline resistance (brakes, tires, bearings, diff) can often be more of the impactful mileage robbers. Inability for the engine to breath (intake, exhaust) are other big culprits. You'll need to begin eliminating the possibilities.
03-27-2014, 11:43 AM
#25
Thread Starter
Join Date: Mar 2014
Location: RI
Posts: 10
Yeah, it's beginning to sound like an engine or driveline issue. If you were to fill up, reset the onboard at the gas station then immediately get on the highway with the cruise control set at the speedlimit, then cruised for about 100-200 miles, the onboard should be reading at a minimum 22-24 MPG. Driveline resistance (brakes, tires, bearings, diff) can often be more of the impactful mileage robbers. Inability for the engine to breath (intake, exhaust) are other big culprits. You'll need to begin eliminating the possibilities.
03-27-2014, 11:52 AM
#26
4th Gear Member
Join Date: Oct 2012
Location: sweden
Posts: 1,128
a v8 in traffic is never gonna give u good mpg..mine gives about 10mpg just city driving.
u dont buy a v8 mustang for fuel economy anyway...buy a small diesel car if you want thet
u dont buy a v8 mustang for fuel economy anyway...buy a small diesel car if you want thet
Last edited by Rudolph Hucker; 03-27-2014 at 12:09 PM.
03-27-2014, 12:10 PM
#27
2nd Gear Member
Join Date: Feb 2013
Location: New York
Posts: 263
His is excessively low. There is an issue somewhere. The only way you'd get mpg like that is if you were heavily modded, barely ever went on the highway and had an amazingly obnoxious lead foot.
03-27-2014, 05:42 PM
#28
6th Gear Member
Have you run any fuel system cleaner thru the engine? Techron is good on a routine basis and for your case I'd use SeaFoam on 2 consecutive tank fulls. Be sure to run each tank down to 1/4 tank or lower if you're not too faint of heart. Also, tire pressure, air filter and fuel filter would be the cheapest 1st steps. But I'd have the brakes checked, too, to be sure they're not dragging. If you're getting 24 MPG highway, you may simply have a minor issue or 2 getting you down below 12-14 MPG city. Stop and Go on ANY tankful will destroy your gas mileage.
03-27-2014, 10:28 PM
#29
Thread Starter
Join Date: Mar 2014
Location: RI
Posts: 10
Have you run any fuel system cleaner thru the engine? Techron is good on a routine basis and for your case I'd use SeaFoam on 2 consecutive tank fulls. Be sure to run each tank down to 1/4 tank or lower if you're not too faint of heart. Also, tire pressure, air filter and fuel filter would be the cheapest 1st steps. But I'd have the brakes checked, too, to be sure they're not dragging. If you're getting 24 MPG highway, you may simply have a minor issue or 2 getting you down below 12-14 MPG city. Stop and Go on ANY tankful will destroy your gas mileage.
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