GrayZee Posted June 22, 2001 Share Posted June 22, 2001 I had a minor fuel leak which I recently fixed, Now that I can fill my tank up I decided to calculate my fuel mileage and lets just say I was quite shocked to see how bad it really was... 14mpg!! Right now I'm running a stock 280z (L28-injection) It runs good and it's not like it is in dire need of a tune up. Do you guys consider this normal or is something wrong? I shudder to think what it will be like when I drop my L28t in there! BTW: This was all city driving and I drive it hard once in a while but most of the time I drive it like a normal person. Quote Link to comment Share on other sites More sharing options...
Drax240z Posted June 22, 2001 Share Posted June 22, 2001 Hey bud. I got around 25mpg on the highway in my 240z's. I don't know exactly what I got around town, I would guess 19-20mpg. The 240z is a fair bit lighter than the 280z though, so maybe that accounts for some of the difference. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted June 22, 2001 Share Posted June 22, 2001 I was getting about 17 mpg with my old L6 (with rich SU's) and a automatic. Now with the chevy conversion, I havn't even tried to check it yet. On the road it would be real good (I'm guessing 22-23 mpg) if and its a BIT IF, I could stay out of the accelerator pump for any extended period of time. Regards, Lone Quote Link to comment Share on other sites More sharing options...
Kevin Shasteen Posted June 22, 2001 Share Posted June 22, 2001 I'ld say you mileage is a little on the low side; something's not right. Start learning to read spark plugs. On the weekend after your engine has cooled off-pull one at a time & check it out; you might want to buy a little magnifying glass w/a light that reflects the light onto the item being viewed-go to your nearest novelty shop/hardware shop; they should have one-check out your nearest Harbor Freight also! Spark Plugs will usually tell you the if you're running extremely rich. On the weekends swap out the old set & put in a new set/then the next weekend put in another set just to make sure you are running an controlled experiment. If your spark plugs are clean/you may have a fuel leak & found it in time: prior to your car catching on fire! Serious-if your loosing that much fuel & this is not an ordinary fuel consumption...it may be a fuel leak-dont leave anything to chance....(been there-done that/its not fun to watch your car go up in smoke). My 240a Besure had the fuel line in the rear break: this line goes from the vapor tank (rear cargo passenger side) behind the trim panel. This fuel line runs inside the car-from that tank around the quarter panel & just under tail lights to the drivers side tail light, (still behind the trim panel) & straight down-thru the body & comes thru near the tank. I dont know if the fuel injected Z's still used this same line or not. Prior to knowing about the leak I filled up with gas & drove away, only to watch the fuel gauge drop. Everyone kept honking at me as they drove by-finally figured out I had a fuel leak; a mojor fuel leak...very lucky nothing caught fire! Nissan Dealer sold me a new one-its a pressure fuel line w/factory bends in it to fit the turns. Check everything-till you can rule out fuel leaks!. Can you smell any fuel leaks or fuel vapor? Has your car been missing/spitting or sputtering on acceleration? Have you noticed an black, white or bluish smoke out your tail pipes when accelerating? You may have a dead fuel injector-or a cracked wire to one of your fuel injectors? Check it out-who knows. My 240z I had years ago-would average about 28 on the HWY (long hauls from College to Home & back) & about 22-24 if/when I could keep my foot out of it. My first month I bought my 240z I averaged 8 mpg...guess I wasnt too good at keeping my foot out of it! My current z, a stock 78 280Z, averages 25mpg-mostly hwy mileage & I'm pretty good about keeping my foot out of it. I'm not trying to scare ya-just think we all know how combustible gas can be. I hope some this has helped or given you some ideas. Kevin, (Yea,Still an Inliner) [ June 22, 2001: Message edited by: Kevin Shasteen ] Quote Link to comment Share on other sites More sharing options...
Drax240z Posted June 23, 2001 Share Posted June 23, 2001 Are we talking british gallons or US gallons? Quote Link to comment Share on other sites More sharing options...
GrayZee Posted June 29, 2001 Author Share Posted June 29, 2001 Ok so I checked my mileage again. This time I got 15.2mpg (that was before I left the city) I rechecked again after a 200mile drive on the highway at 65-70mph and I got 20.5mpg in fouth gear@3500rpm's or so? (I did put a 83zx 5speed in there but 5th gear seems to have screwed up so I couldn't use it) I am guessing that in 5th I coulda got 23-24mpg?? Opinions please.. is this really bad? Quote Link to comment Share on other sites More sharing options...
Kevin Shasteen Posted July 2, 2001 Share Posted July 2, 2001 My 280z is bone stock & unfortunately for me, (fortuanately for you) it has the stock 4spd. I average 23-25mpg. So I dont think you have any worries-other than getting your 5th gear working....welcome to my 4spd Club-it sucks, but hey-the union dues are minimal! Kevin, (Yea,Still a 4spd Inliner) Quote Link to comment Share on other sites More sharing options...
GrayZee Posted July 3, 2001 Author Share Posted July 3, 2001 Yeah well I look at it this way, it's nice to have a car that you can lose your top gear and still cruise down the highway at 70mph! Actually it could be a good thing, because when my fifth gear was working I found myself always drifting up to 80 or 90mph! (not good when the maximum speed limit around here is 100km/62mph) It was too hard driving in fifth at the speed limit (felt like I was lugging the engine!) LOL Quote Link to comment Share on other sites More sharing options...
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