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fuel mileage observed Posted By: 84SEBird On: 12-27-2007 @ 22:35:47 Reply | Edit Ok, my Bird is not specifically a mileage experiment, but with the high gas prices, I'm checking into how much fuel I'm using and was wondering what you guys are getting for mileage. I have a 350 with Edelbrock 600 CFM carb and a 700R4 overdrive. I have been averaging in the 18-19.5 MPG range with a mix of some city and some country road/highway driving. Sometimes I hit as low as 17 MPG and sometimes just over 20. I was wondering if you folks with 350's are getting similar results or if I'm way off the mark. Anyone care to share their MPG numbers? Thanks! Brad -- Brad 1984 Firebird SE- cream-beige- the prestige color! 
1987 Corvette Posted By: useful_idi0t On: 06-16-2007 @ 23:28:12 Reply | Top | Edit when i had my lo3 firebirds i was getting around that mileage, and with 45 extra cubi inches, it seems like your not doing bad at all. how rich is your carb jetted? --  Posted By: 84SEBird On: 06-17-2007 @ 00:25:57 Reply | Top | Edit The Edelbrock carb I have is the #1406, and it comes jetted VERY lean from the factory. It is set up for mileage. Well, I've had to jet it up two steps as it was running way too lean. The plugs were so clean it was rediculous. I now have a small amount of tan deposits on the insulator as I should have. I know it sounds weird, but just jetting this thing up a couple notches made it act like a whole new engine... found a bunch of extra power out of it. I used to hit the 17-18 MPG level quite a bit, but I got rid of the flex fan and went with an electric and switched to Royal Purple motor oil and also put the purple stuff in the rear end. It seems these two things helped a little. I think I may try experimenting with the timing a bit and see if it changes anything. I'm running about 10 degrees at idle right now and I think I can get away with 12 since there's no sign of ping/preignition so far. Thanks for the observations. My dream is to consisitently get 20-25 MPG out of this thing, but I may be dreaming with a 350. They tend to be thirsty! Got to give the credit to the 305, fuel injected cars and the newer LS series of engines for better economy! -- Brad 1984 Firebird SE- cream-beige- the prestige color!
1987 Corvette Posted By: useful_idi0t On: 06-17-2007 @ 01:10:03 Reply | Top | Edit 20 to 25 is realistic but going to be a challenge with the A4, whats your rear gearing and tire size? Posted By: 84SEBird On: 06-17-2007 @ 20:47:55 Reply | Top | Edit Rear gear is a 3.23 which I think is a good compromise between efficiency and acceleration. The tires are 235/60/15. When I bought the car, it had 215/60/15 on them from the previous owner. That was a good inch too small in diameter and putting these new ones on got it back to the original tire diameter, just a bit wider for handling. I guess I need to be fairly happy where I am now as the last 350 I owned a long time ago only got 13-14 MPG. At least I'm better than that! I guess I was wondering if the level I'm at now is realistic for this size of engine and equipment or if I was way under what these cars usually get with a 350 in them. Thanks for the replies! Brad -- Brad 1984 Firebird SE- cream-beige- the prestige color!
1987 Corvette Posted By: Pocket On: 06-17-2007 @ 23:42:09 Reply | Top | Edit 305 TBI A4 before headers and EGR woes.. 32 HW 26 city 23 roadrage mode 305 post headers 26 HW 22 city 17 drive like a nut New 350 TPI runs like crap no exhaust 25mpg HW... -- "If you have complete control over the damned thing, you're not going fast enough." - Carrol Smith Posted By: Green97TAMachine On: 06-18-2007 @ 12:22:58 Reply | Top | Edit My 91 RS use to get to get 28hwy and 20city w/ the ac running. Worst it ever did was 16, and that was a whole tank of nothing but full throttle. 91 RS, 305 TBI, k&n, !cat, dynomax muffler, A4 700r4, 2.73's. -- 1997 Mystic Teal Trans Am, M6, Leather, Hardtop. TB Bypass, CAI, Pacesetter LT's, Flowmaster 80 Series !CATS, !AIR/E.G.R., !CAGS, And a PCM tune done by Thunder Racing.  Posted By: Knight2003 On: 06-21-2007 @ 23:39:55 Reply | Top | Edit in my 87 GTA I am pulling 26-29 on the highway but in town it goes to like 14-15mpg. It has the TPI 350 with a Comp extreme energy cam. Been bored 30 over. I also installed a JET stage 2 chip and a home made cold air intake.I'll post some pictures as soon as i get a digital camera. -- " Live fast" Posted By: camaro91 On: 06-25-2007 @ 04:47:35 Reply | Top | Edit 91 rs, lo3, 3" catback flows, 2.73 = bout 24-26 mpg... i don't get on it that much -- '91 RS, 305 tbi, auto, flowmaster american thunder big plans!  383 stroker from the ground up... 
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