henry172

iTrader: (2)

I am building a 355 11:6:1 with le1 heads and lt4 hotcam 3200 edge racing stall and 3:42 rear gears; I am hoping for 21mpg highway. What are some of you guys with 355 or 383s getting for gas millage?

Turnin20s

iTrader: (12)

On longer trips I can touch 20 but I generally get 15-17 mpg city/highway mixed. But I do not baby my car, I built it to beat on it and thats what I do. I have a 355 11.75:1 compression, old LE3 Heads, CC306 cam, 1.6 rockers, ported intake, 58mm TB, LTs, true duals, 4.10 gears, and a 6 speed. I could probably get mid 20s if I could drive like a human, but thats no fun

RamAir95TA

iTrader: (2)

Not good.

moehorsepower

iTrader: (3)

355 Cu In, Forced Induction, 648 RWHP 25mpg, M6 W/ 3.73 Rear Gear

355z28

iTrader: (8)

With my old 355 I got 18 with the a4, this motor I switched to E85 and get around 14-16. I didnt really build it for mileage tho

wrd1972

iTrader: (12)

13/20 and a tad better if I dont stand on it all the time.

Fazz73jr

iTrader: (3)

Best I've gotten is almost 24mpg (was something like 23.7) that was a 3.5 hour trip to havasu going 85mph most of the way. I average 12-16mpg city/freeway mixed. I also beat on it alot.

henry172

iTrader: (2)

Sound like 21mpg might be possible for my set up. I did not really build it for good mpg, but If I can do better than my moms PT looser; 19-21, I will be happy.

LS1 SPEED

iTrader: (22)

MPG .. does that even apply to most cars here?

I have never once thought to check what the Z gets for mileage.

Torque Fiend

iTrader: (6)

I was getting 11.2 mpg (according to my phone app) before I blew my engine and that was stock (only exhaust and cai).

When I build my 355, I'm sure I'll improve mpgs over my old turd. Ironic isn't it.

AChotrod

iTrader: (17)

haha! X2! I know its not good though!

MasterTomos

iTrader: (15)

AS long as it's MPG and GPM you're golden...

speed_demon24

iTrader: (6)

~25mpg with cruise set at 80-85mph. I don't bother to check around town.

CamaroGuy83

Geez you guys get such good mileage! I guess my tune on my car sucks bad or something

Turnin20s

iTrader: (12)

My tune is a little bit rich and I beat my car like it owes me money, Its pretty sad IMO that my cruiser car gets better gas mileage than my DD.


But I agree with the above statement, "as long as its MPG and not GPM your golden," haha thats awesome

95mysticta

iTrader: (4)

Should do low to mid 20s mpg if you keep your foot out of it on the hwy and stay around 2300-2500k on the hwy. My dads hotcam'd car with a 3.42s does about 25-26mpg in that rpm area.

BOLO

iTrader: (40)

If mpg is important, then keep it STOCK,imo.

quik95lt1

iTrader: (7)

hahah in town i may be in the gallons per mile category lol

i figured it out on the highway one day........i was getting 14mpg cruising at 70 at 2800rpm........actually not that bad for a built stroker

in the city i can actually watch the gauge move lol

Racin96ss

iTrader: (3)

Yeah, a long time ago I got 8mpg around town...its not any better now. 14 sounds about right for hwy and I too see the gauge move even on the hwy...

katz_2003

iTrader: (5)

All hwy I got 22mpg with 3.42s and 6 speed with my new set up. That was durring break in so I was shifting up and down fluctuating rpms. I am getting it dyno tuned this weekend. Seems a little fat on the mail order tune