Cobra4B

iTrader: (9)

Lately have been seeing 13's around town and my rear bumper gets very dirty very quickly. I was still seeing 26ish on the highway.

Tonight I reset the average and took the car out for dinner and a beer. Averaged 18 mpg driving all city and not being super easy on the car.

Last weekend I changed my oil... it had 5000 miles on it, but it had been about 14 months since changing it because of my whole targa project etc. I was considering pulling my oil cooler so was going to change it then, but have decided to keep the Dewitts stuff.

So car got all fresh oil... cracked the oil cooler line to drain that too.

Also, found that my catch can was 100% full of mostly water from condensation. I find that this happens in the winter, but I've never accidentally let it get this full. Could that have anything to do with it... I'd think if I had a PCV block I'd be blowing the dipstick out... which it wasn't.

Could any of that have an effect on my aroudn town efficiency?

Thanks,
Brian

ls1290

iTrader: (20)

Did you use any anti-leadfoot additive this last fill up?

Cobra4B

iTrader: (9)

No... not really.

dixonk

iTrader: (8)

Could it be weather related maybe??

Cobra4B

iTrader: (9)

I really have no clue... I'm not complaining... just curious. I hope it stays this way as I can daily drive the car w/o sucking through gas like a fullsize truck.

dixonk

iTrader: (8)

Are you only going by the DIC or are you actually calculating it? I have heard the one on the DIC sometimes isn't the best to go by. Take my Denali for instance one day it will tell me I am getting an average of 16mpg then the next day it is showing like 10.8 but the driving, distance, and everything is generally the same go figure. One thing is constant though is the distance between fill ups. So I basically stopped going by it.

Cobra4B

iTrader: (9)

Just using the DIC... car used to always show around 19 city when it was mostly stock. After the cam it was 15-17 all the time. Then for awhile it was 13s which was wierd to me.

I'll have to check it manually when I finish this tank off.

dixonk

iTrader: (8)

Ya mine tells me I am making 28mpg with a 408 stroker most of the time but we all know that can't be right I haven't tried checking mine manually yet though. Be interesting to see how close it really is though.

Cobra4B

iTrader: (9)

^ I wouldn't be too surprised. On the highway you should easily get that. I mean C6Z06s get around 27 highway.

WKMCD

iTrader: (2)

My car gets 15 around town driving it like I want to. I get 17 around town if I'm a little more gentle but what fun is that. I get 22-24 on the highway.

Now stop staring at your DIC.

DemonInside

iTrader: (54)

my h/c car was getting 19 accroding to the dic around town and thats with half of the anti lead foot additive

but mpg isnt a concern really with this type of car lol

Cobra4B

iTrader: (9)

^ No... it's not really a concern, but if the car normally gets 17-19 mpg and starts getting considerably less it tells you something has changed.

trumperZ06

As others have said... the dic's reading does vary.

I notice a measurable drop in mileage with the alcohol blended high test.

C5 Z06's... I averaged ~18/20 in town, ~ 24-28 highway.

Once I got as high as 30 mpg. going all the way to Sebring... but we were running 70/75 mph. for the guys pulling trailers.

C6 Z06 gets ~ 17/19 in town, 23-26 highway.

My right foot has been known to influence these results.

Cobra4B

iTrader: (9)

Haha... everything around here is 10% ethanol... maybe I magically filled up w/ normal gas and didn't notice it.

dixonk

iTrader: (8)

Hahah...normal gas...sigh I forgot what that is.

sultan(ZR-1)KSA

check the write and left fule levler that thye showing rite number on you guege

Revengracing14

Hey guys. So im not sure where everyone is. Im located in Phx AZ and i have a 2000 m6 with a cat back sys and an intake and im getting 21 in town and 33 on the highway. And i leave every light like im being chased. I thought this was normal for this car, but it seems like everyone is getting a lot less

Cobra4B

iTrader: (9)

Your car is stock... put a big cam in there and get back with us

Oh... my car is down to 14.7 average for this same tank of gas now. The other night when I was driving it I wasn't sitting in traffic at all and never really got stopped at any lights. Now w/ more stop/go etc. I've watched it fall from 18 to just below 15. Oh well... not really a big deal.

NVR KNO

Your car is just acting like a little bitch.... Thats all. It cant make its mind up.

Cobra4B

iTrader: (9)

Yeah... tell me about it... averaging 14 this tank so far after filling up at lunch. No biggie.... seems pretty much normal for around town driving w/ this size cam. Its no t-rex, but its not small. The G5-X2 specs out at 232/240 .595/.608 and mine is on a 114 lobe.

The next step for this car will be some AFR 205 milled to 59cc. That should get some of the overall gas mileage back.