Evandavis73 Posted September 17, 2015 Share Posted September 17, 2015 I'm still in the process of building my Z so I can't chime in on this just yet, but I am curious to see how other projects have turned out. Obviously, we're not building these things for hypermiling, but I would imagine that with the right gearing in such a light car, that some are seeing relatively good fuel economy for a v8 powered car. My thought is to create a thread where people can post their numbers up just to see what our cars are getting. Post up any relevant info as it applies to fuel economy (i.e.:engine size, carb or efi, etc.). Get as detailed as you would like regarding driving conditions. I'll use my truck as an example of what a good post might look like since the z isn't running yet. EXAMPLE: 1999 Dodge Ram 3500 2wd Dually Engine: 5.9L ISB Cummins Transmission: NV4500 w/US Gear O/D Rear end ratio: 4.11:1 Additional info: Edge tuner, upgraded wastegate, Banks 3" exhaust Observed fuel economy: 24mpg cruising at 60mph in 5th gear with the overdrive engaged ~16mpg around town ~15mpg towing roughly 10,000lbs at an average speed of 55mph in 4th gear with overdrive engaged Quote Link to comment Share on other sites More sharing options...
thedarkie Posted September 17, 2015 Share Posted September 17, 2015 I have a 302 Z but no further pertinent information to post because my speedo doesn't work, and my fuel gauge only ever reads 3/4 full Therefore I'll just post this: it sucks gas like its going out of style, because I drive it like its stolen! Quote Link to comment Share on other sites More sharing options...
Evandavis73 Posted September 17, 2015 Author Share Posted September 17, 2015 Well said! Quote Link to comment Share on other sites More sharing options...
wayverippah Posted September 17, 2015 Share Posted September 17, 2015 77 Datsun 280z Engine: 6.2 LS3 N/A (cammed) Transmission: T56 Magnum Rear end ratio: 4.11:1 (R200H From an R34) Additional info: Shorties, Borla ATAK mufflers Observed fuel economy: 26mpg in 6th crusing at 70 (it's a shame I never drive it that slow...) ~18 in town I had a turbo'd 5.3 LM7 in it prior and had roughly the same MPG. Quote Link to comment Share on other sites More sharing options...
yellowoctupus Posted September 17, 2015 Share Posted September 17, 2015 Engine: 4.6L DOHC Lincoln MarkVIIITransmission: 96-98 Mustang T45, 0.67OD Gears:3.55 Tires: 235/65/14 Body: 1978 280z Around Town: 23mpg Highway: 26mpg Quote Link to comment Share on other sites More sharing options...
Evandavis73 Posted September 18, 2015 Author Share Posted September 18, 2015 Awesome! Keep 'em coming! Quote Link to comment Share on other sites More sharing options...
585Z Posted September 21, 2015 Share Posted September 21, 2015 '75 280Z 351 Windsor, .030 over, X cam, Edelbrock heads, 750 Edelbrock carb World Class 5 speed, .68 5th gear 3.54 R200 rear Approx 17.5 mpg mixed city & hwy Quote Link to comment Share on other sites More sharing options...
whatnow123 Posted September 24, 2015 Share Posted September 24, 2015 Here is my combo. 92 Mustang GT engine. Rebuilt with stock lower end. Aluminum heads, ported intake and a couple of other mods.263 HP, 285 TQ to the wheels.Z spec T5 3:70 LSD 2600 LBS + Power steering and AC I haven't really figured it out because I don't care, but I'm guessing over 30 on the freeway, in the 20's somewhere around town and I am rather "spirited" when I drive it. No idea what I'd get if I kept my foot out of it, but that isn't what I built it for!! I recently had the car dyno tuned, gained about 40hp to the wheels and my fuel mileage actually WENT UP! I couldn't believe it. So much so that I stopped to fill up with gas because I thought my fuel gauge was stuck, I was shocked when it only took just under 7 gallons (3 trips to work, 60 miles round trip + a few errands and I was easily over 200 miles. Quote Link to comment Share on other sites More sharing options...
Michael Yount Posted January 2, 2017 Share Posted January 2, 2017 Well, not a Z, but it will provide another data point. 82 Volvo 242, 2980 lbs. w/o driver; 3.55 gears with T5z (.62 5th); 91 5.0L short block, AFR165, ported Explorer intake, 65mm t/b, 75mm maf, 24# injectors, custom cam (mild duration, lots of lift and ramp rate); 1 5/8" shorties with dual 2.5" exhaust. Routinely got 17-18 in the city and 25-26 on the highway. Best tank of interstate only, really working at it was 28.7 mpg. Just got through swapping in an LS3 --- looks like it's going to do about the same as the 5.0L - with 100 more HP/lb-ft. Quote Link to comment Share on other sites More sharing options...
Ndd Posted May 12, 2017 Share Posted May 12, 2017 Have 84 200sx with 302 gentle hwy driving yielded 21.7 mpg Quote Link to comment Share on other sites More sharing options...
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