Changes in MPG

aim120 · 04-26-2007, 03:25 PM

'93 N/A 5S-FE T-Top

18.4 MPG average

After Change wheel 17"->15" & Techron Fuel System Cleaner.
19.9 MPG

After SeaFoam treatment before change engine oil.
21.3 MPG

I'm always driving in stop'n go cinditions.
I think SeaFoam is very good for MPG.
Next time I will change my fuel filter.

PETC · 04-26-2007, 03:34 PM

The wheels helped because A. they were heavier and B. Your speedometere was messed up. The seafoam may have helped, but a difference of 1.4 MPG is much more easily attributed to driving style rather than seafoam or engine additives.

I'd suggest getting a new O2 sensor, new wires, new fuel filter, new air filter, new plugs, a new cap, checking your ignition timing, and then go drive normaly. You should be getting around 25 MPG city and 30+ on the highway if your motor is in good condition.

aim120 · 04-26-2007, 03:38 PM

Quote:

Originally Posted by PETC

The wheels helped because A. they were heavier and B. Your speedometere was messed up. The seafoam may have helped, but a difference of 1.4 MPG is much more easily attributed to driving style rather than seafoam or engine additives.

I'd suggest getting a new O2 sensor, new wires, new fuel filter, new air filter, new plugs, a new cap, checking your ignition timing, and then go drive normaly. You should be getting around 25 MPG city and 30+ on the highway if your motor is in good condition.

Thanks.
Change all of O2 sensor? I know we have 4 O2 sensors. right?
Which one should I change?

PETC · 04-26-2007, 03:48 PM

4? Christ, you should only have 1. 2 if you live in California.

mopwer · 04-26-2007, 08:21 PM

Cleaning the injectors will help too, depending on the milage.

jrs2 · 04-26-2007, 08:32 PM

After I got my '93 N/A my mileage went from 22-23 to 28-30+ after plugs, wires, cap, rotor, filters and timing. Your basic tune-up can make a big difference.

If that doesn't help then the O2 sensor is definitely suspect.

Gairloch · 04-27-2007, 12:41 AM

Don't forget that your right foot can make a tremendous difference. I was getting 34mpg freeway, 28 mpg city and 12mpg on the race track with my NA.

04-26-2007, 03:25 PM	#1 (permalink)
aim120 No Skills Join Date: Feb 2007 Location: Columbus, OH Posts: 25 Thanks: 6 Thanked 1 Time in 1 Post My Google Map iTrader Rating: (0/0% )	Changes in MPG '93 N/A 5S-FE T-Top 18.4 MPG average After Change wheel 17"->15" & Techron Fuel System Cleaner. 19.9 MPG After SeaFoam treatment before change engine oil. 21.3 MPG I'm always driving in stop'n go cinditions. I think SeaFoam is very good for MPG. Next time I will change my fuel filter. Attached Thumbnails Last edited by aim120; 04-26-2007 at 03:34 PM.. Reason: ?

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04-26-2007, 03:34 PM	#2 (permalink)
PETC √(176400) Join Date: Nov 2005 Location: Bellingham, WA Posts: 2,690 Thanks: 43 Thanked 65 Times in 53 Posts My Google Map iTrader Rating: (4/100% )	The wheels helped because A. they were heavier and B. Your speedometere was messed up. The seafoam may have helped, but a difference of 1.4 MPG is much more easily attributed to driving style rather than seafoam or engine additives. I'd suggest getting a new O2 sensor, new wires, new fuel filter, new air filter, new plugs, a new cap, checking your ignition timing, and then go drive normaly. You should be getting around 25 MPG city and 30+ on the highway if your motor is in good condition.

04-26-2007, 03:48 PM	#4 (permalink)
PETC √(176400) Join Date: Nov 2005 Location: Bellingham, WA Posts: 2,690 Thanks: 43 Thanked 65 Times in 53 Posts My Google Map iTrader Rating: (4/100% )	4? Christ, you should only have 1. 2 if you live in California.

04-26-2007, 08:21 PM	#5 (permalink)
mopwer 933SGTE Join Date: Nov 2006 Location: Peoria, AZ Posts: 1,096 Thanks: 24 Thanked 14 Times in 14 Posts My Google Map iTrader Rating: (12/100% )	Cleaning the injectors will help too, depending on the milage.

04-26-2007, 08:32 PM	#6 (permalink)
jrs2 Some Skills Join Date: Apr 2007 Location: California Posts: 58 Thanks: 0 Thanked 9 Times in 8 Posts iTrader Rating: (0/0% )	After I got my '93 N/A my mileage went from 22-23 to 28-30+ after plugs, wires, cap, rotor, filters and timing. Your basic tune-up can make a big difference. If that doesn't help then the O2 sensor is definitely suspect.

04-27-2007, 12:41 AM	#7 (permalink)
Gairloch Dreaming of apexes Join Date: Aug 2005 Location: Minneapolis, MN Posts: 5,313 Thanks: 139 Thanked 296 Times in 264 Posts Blog Entries: 4 My Google Map iTrader Rating: (7/100% )	Don't forget that your right foot can make a tremendous difference. I was getting 34mpg freeway, 28 mpg city and 12mpg on the race track with my NA.