Horrible gas mileage! Help!

FASTLLS said:
Do you guys have to deal with winter gas though?
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Here in The People's Republik we have so many additives gas is hardly gas anymore. I get at least 10% better mileage whenever I get non-Kahleefornya gas.
 
BlackLS06 said:
Insane.

You must drive nothing but highway and never idle the car.
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I have averaged that for about 4 years. My commute is 45-55MPH (55-65 when the road is not congested) fot about 60 miles per day. I also have about 8 miles per day of city driving. I do not idle the car at all before or after commuting. My origonal average was 23.5, but after the XCAL tune from Torrie it has been 25+. If this helps my 99 F150 4X4 got 13.5MPG when I lived in south carolina, but when I moved to the Florida Keys I could get 20 with my current commute.
 
scjmc said:
I have averaged that for about 4 years. My commute is 45-55MPH (55-65 when the road is not congested) fot about 60 miles per day. I also have about 8 miles per day of city driving. I do not idle the car at all before or after commuting. My origonal average was 23.5, but after the XCAL tune from Torrie it has been 25+. If this helps my 99 F150 4X4 got 13.5MPG when I lived in south carolina, but when I moved to the Florida Keys I could get 20 with my current commute.
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Nice.

Most i saw was 330 gallons on a full tank when i made a 300 mile highway trip at a steady 70mph during the summer. I know its over 20mpg but not quite 25.

I remember we took a rental camry hybrid down that same trip and it got 33mpg most the way.
 
BlackLS06 said:
Nice.

Most i saw was 330 gallons on a full tank when i made a 300 mile highway trip at a steady 70mph during the summer. I know its over 20mpg but not quite 25.

I remember we took a rental camry hybrid down that same trip and it got 33mpg most the way.
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For some reason this sea level highwayish commute has always netted me better MPGs than the EPA ratings. Hell my 71 Mustang 351 gets 21. My work truck though (heavy city and idiling) usually lands around 9MPG. I can't help but calculate mileage sorry.... I don't drive for it though.
 
Well whatever, knew I shouldn't of bought one of these damn cars. Never heard anything good about them ever! haha
 
I was thinking something along the lines of an SUV that can at least get around in the winter or get into another Mustang that's worth burning gas in. haha
 
Me? Not so much...

FASTLLS said:
When my cats failed, it was when they were almost plugged to no flow, that's when the CEL came on..
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??? None of my experiences seem to match up here.
When my CEL came on and the code was "underperforming cats" the car was getting good mileage (320 mi/tank) and even passed CA smog check with a sniffer in the tailpipe.
Before the smog check I cleared the CEL and it'd stay off for a couple days.
 
BLKDOUTLS said:
Ok, I know it's winter and I have been using my remote start alot and considering the other factors that come with bad gas mileage during the winter but seriously. I have an 05 LS6 and barely get over 200 miles on a tank! I changed my fuel filter a couple months ago not long after I bought this car. I have no clue why it would be getting this horrible of gas mileage. The car runs fine and I don't ever get all the way in it or anything dumb like that. I had some tranny work done under warranty about a month ago now... Does the car need to have the reset deal done like another post I read on here recently or something? Ideas PLEASE!? Thanks!
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I think for every minute a car seats idling, it uses about the same amount of fuel it takes to go about one mile. Every car will be a little different, but if you think about, if you remote start the car and let it warm up for 10-15 minutes, that's about 10 miles of driving you are giving up.
 
RCodePaul said:
??? None of my experiences seem to match up here.
When my CEL came on and the code was "underperforming cats" the car was getting good mileage (320 mi/tank) and even passed CA smog check with a sniffer in the tailpipe.
Before the smog check I cleared the CEL and it'd stay off for a couple days.
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I would say the downstream O2s were bad then.. Because you don't get good gas mileage with the cats plugged.. And normally (from my experiences), when I cleared the code, it would stay off for like 2 hours..
 
FASTLLS said:
I would say the downstream O2s were bad then.. Because you don't get good gas mileage with the cats plugged.. And normally (from my experiences), when I cleared the code, it would stay off for like 2 hours..
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The downstream sensors are passive. They rarely fail. The up-stream sensors will trigger an under-performing condition.
 
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