BrandonsZ Posted January 24, 2006 Share Posted January 24, 2006 I think mine is now tuned enough to talk turkey. 27mpg hiway @65 (no showing off, light throttle to enter the freeway) 19mpg city and limited hiway (driving to work daily always showing off especially to get on the hiway and to test the secondaries for mechanical soundness) Still can't make it a week without messing up what a non-showing off test would be. 16mpg pure city and showing off Engine I have a pre-LT1 350 with edelbrock performer heads, edelbrock performer intake, edelbrock avs 650cfm carb set 3/4 turn out both sides from "best lean" for idle otherwise stock nominal jets and rods. Base timing set at 14 Spark gap .035 Vac advance on full manifold vacuum MSD stock weight advance. 2000 miles all new. Exhaust sanders 1.75" shorty headers to 2.5" dual exhaust to 3" single exhaust through a high perf cat, a spiral baffle resonator and a Delta 40 muffler. (Still loud) Tranny LS1 T56 adapted to said engine. .50 6th Diff = stock R180 3.36:1 Tires = Stock steel 14"x5" rims with goodyear standard P185 75 R14's. Misc No body mods. Clean paint. You? Quote Link to comment Share on other sites More sharing options...
qwik240z Posted January 24, 2006 Share Posted January 24, 2006 26mpg Hwy @ 75-80mph with a little showing off and a few blasts up to 120mph. 20mpg mixed city and some hwy with lots of fast blasts and some showing off. 10 mpg at Summit Point Raceway for a track day. Engine 2002 F body LS1 Stock. No tuning yet. Air intake K & N cold air intake Exhaust Sanderson 1.75" shorty headers to 2.5" dual exhaust to behind the trans and then to 3" single exhaust back to the muffler. Tranny LS1 T56 Diff = Nismo R180 LSD with 3.54:1 Tires = Mileage shown was on 195-60-14 Falken Azenis tires on 14" X 7" Konig Rewinds. I just got a set of Panasports 16" X 7" with 225-50-16 Pirelli Tires so I may have to repost after a road trip. Misc Shaved emblems, euro bumpers and taillights. Clean paint. You? Quote Link to comment Share on other sites More sharing options...
crazy280 Posted January 24, 2006 Share Posted January 24, 2006 Haha, damn! You guys beat the HELL outta my old L24! My SU's are leaky through the throttle shaft so I have to run them at around 3 turns out to remain driveable. I get about 15 city and *maybe* 20 highway on a long trip. I do pass CA smog at the pipe with flying colors though (even though I don't have to)! 1973 240z L24, twin SUs ('72), custom airbox, custom balance tube ZX elec. dizzy ('79) stock 4 speed tranny stock R180 3.36 American Racing mags, 215/60/14 yokos very poor paint (currently saving $$ for L28et) You? Quote Link to comment Share on other sites More sharing options...
Dan Juday Posted January 25, 2006 Share Posted January 25, 2006 23mpg highway (might do better if I would slow down) ?mpg city (who cares!) '91 305 tpi WC-T5 with .63 5th gear 3.70 R200 rear end Quote Link to comment Share on other sites More sharing options...
Sparks280zt Posted January 25, 2006 Share Posted January 25, 2006 26-28 mpg highway 22-23 city Always driving hard, shifting at 4-5k often. 1987 300zx turbo Entire car is stock 3.0 Vg30 Turbo Tires - 225-50-16 on stock 16x7 wheels Quote Link to comment Share on other sites More sharing options...
zdmz Posted January 25, 2006 Share Posted January 25, 2006 The best I ever did was on a trip from Reno to Vegas in my 71 z. Everything in the car was stock - averaged almost 90mph on the trip and got 30 mpg. It was a fun trip. After I changed over to a mild performance cam and triple mikuni's things went downhill. From Vegas to Battle Mountain I think I was lucky to get about 10 mpg. Quote Link to comment Share on other sites More sharing options...
MusPuppis Posted January 25, 2006 Share Posted January 25, 2006 41mpg highway 36-ish city bone stock 290,000mile 1989 Honda Civic w, busted front bumper, tractor headlight (literally), no radia, no cruise, manual and annoying exhuast. DD. approx. 22mpg highway approx. 15mpg city 92 5.0 HO swapped (some work) 94 F-150. Leaking off pressure at the TC and pump which is killing my mileage. Id assume around 25/18 running properly. We'll know for sure come mid February. and the Z.. Is still a shell. So, really, it gets great gas mileage, cause its driven about 200miles since December and hasnt used a drop. Hell, it doesnt even have a gas tank. Quote Link to comment Share on other sites More sharing options...
Here comes trouble Posted January 25, 2006 Share Posted January 25, 2006 Not quite sure, I will ask the bus driver the next time I get on. I do not qualify for the senior citizen discount yet Quote Link to comment Share on other sites More sharing options...
Cruez Posted January 25, 2006 Share Posted January 25, 2006 Not quite sure, I will ask the bus driver the next time I get on. I do not qualify for the senior citizen discount yet LOL ! Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted January 25, 2006 Share Posted January 25, 2006 umm.. 18 MPG in the city... no idea with highway or mixed highway.. since the highways in Denver are bumper to bumper all the time.. it's considered city.. under 30mph.. arrgg Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted January 25, 2006 Share Posted January 25, 2006 1 mile to the gallon, no showing off, simple 5 mile drive one way to a buddies house to let him listen to the motor. Never broke 45 mph. Oh, thats on alcohol, but still, seems like great mileage to the shah of Iran. Quote Link to comment Share on other sites More sharing options...
EZ-E Posted January 25, 2006 Share Posted January 25, 2006 82 ZXT, T3/TO4E turbo, 370cc injectors, 60mm TB, Intercooled, 3.7 LSD with B/W Tranny, 200k stock bottom end, still unfortunately stock electronics, city mileage is 18mpg and highway best was 29mpg, average highway is about 26mpg. Quote Link to comment Share on other sites More sharing options...
Guest tony78_280z Posted January 25, 2006 Share Posted January 25, 2006 16-19mpg (highway, with the 16 getting on it more frequently) in my 5.0L 280z 2+2, with holley vac 2nd, and 700r4 (4 speed automatic) tranny. Hopefully this motors days are numbered as I'll be installing my 5.7L soon. I expect my milage to go up with this motor as it has higher CR, true dual plane intake manifold, and better heads. (we'll see though) I also expect to increase my mpg when I install my rebuild quadrajet. Quote Link to comment Share on other sites More sharing options...
Mikelly Posted January 25, 2006 Share Posted January 25, 2006 My 383stroker equipped Z was running the T56 Tranny, a BG 750 race carb, singleplane high rise intake, and 3.70 gears turning over 26.5inch tires. In 6th gear on the interstate cruising at about 80MPH I'd get around 22mpg. I would have gotten better, but the cam/carb/vacuum issues precluded the car from running properly at lower cruise RPMs. I'd maybe done better with it in 5th gear instead of 6th. Who knows. I've seen over 30MPG in the C5 w/LS1-T56 combo and 26inch tires turning stock 3.42 gearing. With the current 445flywheelHP I'm seeing 27.5-28mpg on the interstate cruising at 78mph. In town it falls off to 23-24mpg if I behave. Yea, like that happens! Mike Quote Link to comment Share on other sites More sharing options...
Phantom Posted January 26, 2006 Share Posted January 26, 2006 Not to be a butt - but - I don't believe any of these numbers. I have seen no standard for determining fuel consumption on any of these posts which means, at best, everyone is probably doing it differently and, at worst, folks are just "swag"ing off their gas gauge and odometer - or even worse yet, using the average MPG that the computer generates on newer cars. I've found that number to be as much as 20-25% higher than actual. To ensure accurate information I "top off" my tank at every refill. That's the thing that all the gas stations tell you not to do to eliminate fuel spillage. I fill the tank right up to the inner lip of the inlet pipe so I know I fill to the same level +/- 1/4" every time. I reset my odometer each time and record the fuel to the nearest 1/10th of a gallon. Even then it varies by as much a +/- 1 mpg based on driving conditions. This is usually a lot more effort that most folks are willing expend so it seldom gets done this way. Quote Link to comment Share on other sites More sharing options...
BrandonsZ Posted January 26, 2006 Author Share Posted January 26, 2006 Not to be a butt - but - I don't believe any of these numbers. I have seen no standard for determining fuel consumption on any of these posts which means' date=' at best, everyone is probably doing it differently and, at worst, folks are just "swag"ing off their gas gauge and odometer - or even worse yet, using the average MPG that the computer generates on newer cars. I've found that number to be as much as 20-25% higher than actual. To ensure accurate information I "top off" my tank at every refill. That's the thing that all the gas stations tell you not to do to eliminate fuel spillage. I fill the tank right up to the inner lip of the inlet pipe so I know I fill to the same level +/- 1/4" every time. I reset my odometer each time and record the fuel to the nearest 1/10th of a gallon. Even then it varies by as much a +/- 1 mpg based on driving conditions. This is usually a lot more effort that most folks are willing expend so it seldom gets done this way.[/quote'] I fill it till I see it in the pipe. Every time. and reset my 1972 trip meter which is calibrated eceltrically through a converter. I paced my wife's ES330 at 70 mph, she was going 70 (which is where I cruze the hiway I'm not much for speeding here in So Cal. CHP is pissed all the time!), it said I was going 69-71 depending on which bump I hit or if I had the blinker on. And I go the same distance to work in my Z as I did in my 1990 240DL so three cars spanning 34 years have to be wrong to be off. Is that good enough? Quote Link to comment Share on other sites More sharing options...
Phantom Posted January 27, 2006 Share Posted January 27, 2006 wwelll - maybe:redface: ? Quote Link to comment Share on other sites More sharing options...
Mikelly Posted January 27, 2006 Share Posted January 27, 2006 Phantom, That's an "Azzumption" that I'd be careful making. With my previous 383 stroker setup, the filler was in the floor of the rear hatch. It was a fuel cell cap and you basically had to pay real close attention or you would overfill it like a gas can. I filled it to the brim EVERY time. With the Vette, I drive it so much that I do the math and top it off every time and I check the mileage against that of the computer built into the ecu, which calculates the average. My math is always within half a mile per gallon of the ECU. Mike Quote Link to comment Share on other sites More sharing options...
DaleMX Posted January 27, 2006 Share Posted January 27, 2006 I just drive until I need gas, fill up, drive like H***. Gas mileage is anything from 8 to 23 depending on my mood. With the LS1 and 36 lb injectors, cam, 90mm TB all it takes is a couple of hard runs to 100 and you can watch the gauge go down. It takes fuel to make power, and I run it a little rich on purpose (Flash Scan Tunning). Quote Link to comment Share on other sites More sharing options...
b__sosick Posted January 27, 2006 Share Posted January 27, 2006 one of these days i might learn to stay out of the throttle and maybe i'll get better than 16-18 mpg! edit: nahhhhh Quote Link to comment Share on other sites More sharing options...
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