100 mile+ increase per take [Archive] - GrandAmGT.com Forum

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tomh
12-03-2005, 10:14 PM
any ideas why i have gotten about 360 miles per take before the light comes on the last 2 tanks? And for the past year i i have been only getting 280 miles a take before the lights come on

badboy2451
12-03-2005, 10:27 PM
why put it in this section?

but on topic, no idea...i thought mpg were supposed to go down during winter

tomh
12-03-2005, 10:32 PM
yeah.. i didnt mean to put it in here.. that was a mistake.. i cant delete my post so im gonna have to wait until a mod does something :)

MSJHWT
12-03-2005, 11:16 PM
Changes in driving habits? Changed fuel filter/air filter? Any Mods? More highway driving? Changes in where you fill up in gas and or grade?

tomh
12-04-2005, 12:04 AM
nope nothing different.. cept i did about 100+mph for like 5 miles on each tank (which would suck more gas)

tenspeed
12-04-2005, 07:25 AM
You may have blown some carbon out of the engine.

nascarnate326
12-04-2005, 08:31 AM
hmmm, I think im going to try and blow some carbon out too....

tomh
12-04-2005, 11:50 AM
You may have blown some carbon out of the engine.

any way to clean it?

actually my gf reminded me that i also did about 130 mph on the first tank that better gas millage

tenspeed
12-04-2005, 03:50 PM
.. cept i did about 100+mph for like 5 miles on each tank (which would suck more gas)

That would also heat areas hotter than normal and cause higher flow through the engine. In older carborated engines, a high speed run would make it run better, especially if it was driven by a older driver. Dark smoke would blow out the exhaust during the first couple of full throttle take offs. You could see it in the rear view mirror.

tomh
12-04-2005, 06:14 PM
i dunno i mean i have done stuff like that before in the past year and it never got me an extra 100 miles on a tank.. humm i just would love to get back close to 30 mpg like i was little over a year ago the last year i have been only running like 25 mpg.. something i could change in my engine to correct this problem? i know my car is almost 90k on it now.. but this low mpg started at around 60-65k im guessing

i think tomorrow when i fill up i might get some of that high octane shell v plus stuff i guess its suppose to "clean" the engine some how

Ajaxus
12-04-2005, 06:24 PM
more highway driving? less stop and go traffic? the gods have blessed you?

(my 3 guesses)

tomh
12-04-2005, 07:40 PM
more highway driving? less stop and go traffic? the gods have blessed you?

(my 3 guesses)

yeah must be #3..

i have not really done any different driving then i have in the past

Ajaxus
12-04-2005, 07:53 PM
hmm, what gods should i pray to then?

SikMindz
12-04-2005, 08:23 PM
any way to clean it?

Seafoam or Top Engine cleaner. Ive been seeing upwards of a 6-7MPG increase since I did it a few weeks ago. Do a search for it...there are quite a few threads from the past few months.

tomh
12-05-2005, 05:59 PM
well today i put gas in... only 26 mpg like normal... did good for 2 tanks.. im going to try to buy some Seafoam tomorrow and see if i can get it in the car this weekend