13 city/21 hwy, and thats not beating it

Cant seem to get the carb right on the damn thing. One day works great, next it sucks. oh well.

 

Well I just drove my 84 TA on a 67 mile trip I used 2.3 gallons of gas that is 29.1 mpg..... That seems to be too high, but a I filled it up exactly each time squeazing in up to the neck.. Its an L69 305, T5 3.73 rearend... I babied it and drove 55 to 60 mph the whole way. It has 40,300 miles on it with a new cap rotor plugs and wires slp headers and y pipe flowmaster catback.. oh well I am happy with it even though its not that fast is sounds good and it fun to drive..

 

there are a few that might be able but most of them are 4 cylinders or 6 cylinder motors

though I think a few reputable members have gotten close to that with some good tuning in the ECU to lean out the mixture a tad at hwy cruise speeds

 

16 town/24.5 highway @ 75-80
305 TPI/700R4/3.23 rear in 40 Chevy coupe.
Engine is pretty much stock w/1.6 rockers and I've been tuning it a little.

 

I have a 305 with tbi its a 700r4 with 2.73 gears . i am going on a 8 hour round trip next week on the high way. i will check it then . but if it doesnt get at least 30 i will be very suprised. it does like 1700 rpm at 70 mph.

 

my combo in the sig gets 28mpg on the highway at 70mph. in mixed driving back and forth to work I get 24-22 usually.

 

19 and 22mpg??? WTF? I get only 14mpg street OR highway (1984 Trans Am stock L69, auto 700R4, 3.73:1 gears, stock everything except flowmaster exhaust.) My torque converter isnt locking, but still, my mileage is way too low

 

Well, after messing with my timing a bit, installing a new ignition, plugs, plug wires, re-setting my cruise (84's have the dumbest cruise set up I've ever seen), and changing most of my vacuum lines, I'm finally nailing 22mpg on the highway at 65 and 18 around town. Oh yeah, AND I fixed a leaky fuel pump. I probably lost a gallon over a tank from that thing.
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Yes, you definitely have a problem. Those are the kind of MPG numbers I'd expect to see out of a stroker....

 

wtf, I cant get better than 14mpg mixed. I can't figure it out.

 

gas mileage=not enough.. around 7-8 mpg.. but i dont care.. its a fun 7-8 mpg..

 

I expect the day that I finally drop in my 355 that my gas mileage will take a dump.

Right now, I drive it every day because well...I get better MPG than my truck does. ...and it's a 2006! haha That and it's a lot more fun to drive.

 

right no i am getting 11.3-13 mpg depending on how i drive it in the city.

 

I get 10.5 mpg if I'm lucky. I got 11.75 mpg, but it wasn't very fun that tank. And I have a stock L03. It's bad.

 

I've got a 91 305 in my 86 Z-28 with 600 edelbrock and performer, 700r4, 2:73 rear. I'm averaging 15-16+ in the city. Haven't had it on a highway in a long time. Gas was almost $3.00 and I was thinking about selling but gas came back down a bit $2.69. And it something breaks I can fix it without using a computer.