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gas mileage



Im not trippin lol I have it in L/100km. Thats what I've got on the highway heading home. There was no idling and no city driving. I work night shifts so city driving is doing seventy and green lights all the way. I took it out yesterday and its dropped to 19mpg. I will be doing math my next highway trip since the display couldnt be inaccurate for my highway one
 


i got 6.2l/100km going 100km/h(62mph) in my 3.8 the highway,but in the summer heat and I have some flow mods and a incar tune
 
seafoamed my gas after i put 93 octane in, changed the oil, and put air in the tires. normally i was getting around 20.6 but right now the dic is just over 19 with no changes in driving habits
 


Yeah it def wouldn't hurt. Im replacing the fuel filter as well and will run seafoam thru gas tank, oil, and vacuum lines. Hoping to smooth out my idle a bit and get back some mpg's.. Also a ubend delete to free up the exhaust more

I'm sorry, new Grand Prix owner, wondering what engine has the ubend. Thanks.
 
I'm only averaging 200 miles or less to a tank, and I DO NOT beat on my car. I hit over 300 not too long after I bought it (Aug. 2012), but that was straight freeway 180 miles each way. Anyway...maybe I'm due for new plugs/wires/fuel filter? I was thinking if doing a fuel system cleaning, as well. It has 94k on it, and I'm not 100% sure its had a recent tune up, or even one at all. I got it from the original owners, and they only averaged 6k miles a year.
 
My A3 gets about 350 miles a tank :)
My grand prix was less than 230 miles a tank :p

Although my fuel savings are offset by having to run premium :thumbdown:
 
I average 23(if I'm lucky) when its cold out and about 26 in warmer weather all highway miles. I get an EGR code when it gets below about 45-50 degree f outside.
 


I get about 21-22 city in my bone stock 99 GTP. I seem to get about 25-26ish highway. I have a code (p0440) so once I get that figured out maybe it'll help a little. I'm not sure how much I get out of a tank.
 
I get about 19-22 on average and if I'm taking trips loaded down with 4 people and stuffed trunk I get 28 at about 75mph.

05 Grand Prix GT
Open cone intake
 
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