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gas mileage

Found out my crappy mileage was caused by the vac line on the fuel regulator being unplugged..... Noticed on torque that the vacuum was sitting at 18 found the line put it back on and went back to 21
 


Dee23 said:
Yes, vacuum leaks can interfere with getting optimum MPG. Vac leaks arent monitored, so the MAF,IAT,IAC, arent reading that extra amount of air so the meterization gets thrown off and also it can be dirty air depending on how bad the leak is bc its not being filtered either by your air filter.

If i can remember right, I think the Vac PSI should be around 19-22psi but if u do manage to get the VAC gauge just hook it up to the brake booster line. For a easy quick check, use CARB cleaner and spray on all the VAC lines and listen for the change of the idle.
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Come to think of it I need to check and probably clean my air filter. Just changed it about six months ago but I drive a dirt road on a normal basis
 
I have no ideal. All i know is I fill my tank once and I do not have to get more gas for over 3 weeks and that is on a 3800 v6
 


3800 II V6 here. 24-26 mpg range. 30miles everyday through nothing but flat farm country. Burns about $45/week worth of gas. I don't always fill it either.........damn oil prices.
 
Drove 60 miles to Madison today, drove around there for a while, and by the time I got back I think I averaged about 25. Forgot to check when I got home, but it was 24.5 half way back.
 
Consistently getting 300-330miles on a full tank doing city driving only.This car even with boost is not bad on gas but its when i get on it and can just watch that needle drop thruout the day lol.
 
i got my average up to 16 today driving around town, lots of stop and go. this is since the lim job and new vac lines, it never went higher then 14 tops before.

2 new o2 sensors may get it back to 18-20 around town???????
 


14 is the high side of around town, most of the time, (i was getting before the lim job) 10 to 12 was the norm. now if it drops to 12 it comes back up to 15/16. it never did that before.

and ive read a list someone posted that o2 only last for 60, or 80,000 miles, ( dont know how true that is) i got 225,000 almost and no service records but my own. figure it cant hurt.
 
Last tank I averaged 24.5mpg calculated (DIC read 25), mixed city highway.
Over summer I was commuting to downtown milwaukee averaging 55-75. Calculated 28. DIC read 32-33 from the time I left my garage, till the time I parked at work.
 


GTP in RTP said:
You proly only drive 15 miles a day.

How many miles since your last oil change ?
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I drive about 2-4 miles a day. I am getting an oil chnage next month. I just bought the car a month ago and I have no idea when it was last changed. The change oil light has not turned on yet.
 
2001 Grand Prix 3.8GTP getting 23.4 average country driving. Has always been in that range. Dunno what range is, but when I fill the tank it shows 370 or so miles.

Steve
 
99 buick regal gs with my speed sensor bad, I get about 21-22 driving between 35-55 mph work and back. I have yet to do an accurate test for highway but the computer dances between 27-33 mpg on instant mileage driving between 65-75mph
 
I get around 400 - 450 miles per tank if I do straight highway driving, but that's non stop =P
if I drive highway with stops and what not, I can get probably 350 - 390 miles.
City, I get probably around 250 - 310 miles per tank give or take
 
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