datzenmike Posted August 23, 2017 Report Share Posted August 23, 2017 Well running with the choke on all the time will dirty them up. Having the choke turn off when not needs would surely make them cleaner or keep them cleaner. 1 Quote Link to comment
mx71 Posted August 23, 2017 Author Report Share Posted August 23, 2017 Got it. 1 Quote Link to comment
mx71 Posted August 25, 2017 Author Report Share Posted August 25, 2017 Well, embarrassingly, I think I found the problem. I appear to have the 12 gallon tank, and not the 19 gallon tank I thought I had. Seems I'm getting around 15 mpg. (Running 235s instead of 215s, so not sure of actual mileage driven). 1 Quote Link to comment
datzenmike Posted August 25, 2017 Report Share Posted August 25, 2017 I think the long bed 4x4 is the largest. I believe its about 14 US maybe 15 1 Quote Link to comment
mx71 Posted August 25, 2017 Author Report Share Posted August 25, 2017 Well, according to the replacement parts, my 85 KC 4x4 should have a 19 gallon tank, but I ran the truck nearly dry and put 11.xx gallons in it. 1 Quote Link to comment
datzenmike Posted August 25, 2017 Report Share Posted August 25, 2017 I'll check when I get home. Imperial/liters/US gallon confusion. The cab results in a notch in the top of the tank for clearance. The long bed also has a notch but is longer. 1 Quote Link to comment
MaxChlan Posted August 25, 2017 Report Share Posted August 25, 2017 According to my Nissan Trucks Brochure dated 1985, here is what the fuel tank sizes are in US gallons: 2x4 Regular Bed: 13.2 Long Bed: 16.9 Cab and Chassis: 16.9 King Cab: 13.2 4x4 Regular Bed: 15.8 Long Bed: 19.8 King Cab: 15.8 As a side note, I have never filled my truck up passed 13 gallons (86 KC 4x4), so I am assuming that when the gauge reads on E, you still have at least two gallons left. I am not sure how you are checking your mileage, but what I do is reset my trip odometer every time I fill up, and when I fill up next, divide the miles driven by the amount of gallons I put into the tank. 1 Quote Link to comment
dat521gatherer Posted August 26, 2017 Report Share Posted August 26, 2017 Always divide your mileage by how many gallons you use not how much your tank holds. 2 Quote Link to comment
datzenmike Posted August 26, 2017 Report Share Posted August 26, 2017 Fill up completely and set odometer to zero. Next time you top up gas, record the amount and mileage and reset odometer. If you just added gas but don't fill completely just record the amount of gas. The next time, do the same... unless you fill completely. Then add up all the gas used and record the mileage. Zero the odometer. Mileage divided by gallons added = MPG. Keep a log off all gallons added and all distances traveled. Do not include the last miles driven unless you completely fill up. Add all gallons and total all mileages and divide for a much more accurate average MPG. Last year I totaled about 2,734k miles on trip to Canby. My over all average was 29.324 US MPG. 1 Quote Link to comment
mx71 Posted August 26, 2017 Author Report Share Posted August 26, 2017 That's what I do, but I have 235/75r15 tires, not the 215/75r15 it came with, so the odometer is off. Quote Link to comment
captain720 Posted August 26, 2017 Report Share Posted August 26, 2017 I thought 235 75r15 was the stock size? I have never put more than 12 gallons in my 4wds tank. Quote Link to comment
datzenmike Posted August 26, 2017 Report Share Posted August 26, 2017 P215/75R15 stock 4x4 Then you are actually going farther than what it says. About 6% farther. So if you go 210 miles on 14 gallons on your next tank of gas and get 15 MPG you actually got 15.9 MPG because you went 6% or 12.6 miles farther. Almost a gallon of gas farther. At 50 MPH you are also going faster than indicated by about 3 mph. Quote Link to comment
mx71 Posted August 26, 2017 Author Report Share Posted August 26, 2017 Got it. Last time I filled, I put about 11.3 gallons in, and had 170 on the tripometer. So roughly 180 miles on 11.3 gallons = 15.93 mpg. Not bad I guess for a motor with 173,000 miles and I'm sure needs new rings and a valve adjustment. Quote Link to comment
datzenmike Posted August 27, 2017 Report Share Posted August 27, 2017 Nice. Problem.... solved. Quote Link to comment
captain720 Posted August 27, 2017 Report Share Posted August 27, 2017 Honestly that is pretty normal for these trucks. Max says he gets 21, but I don't think he ever goes uphill. :) I on the other hand am constantly driving uphill because I live in a valley so my millage is a little lower than yours. 1 Quote Link to comment
mx71 Posted August 27, 2017 Author Report Share Posted August 27, 2017 Well, I live in the hills so I go up (and down) two fairly steep hills every time I drive it. Quote Link to comment
MaxChlan Posted August 27, 2017 Report Share Posted August 27, 2017 Honestly that is pretty normal for these trucks. Max says he gets 21, but I don't think he ever goes uphill. :) Hey! I have to climb over the mountains of salt they throw down on our roads every winter! :crying: Quote Link to comment
mx71 Posted September 29, 2017 Author Report Share Posted September 29, 2017 Update! I went 184 miles on the last tank, so taking into account the larger tire size, 184 + 6% = 195.04 / 11.3 gallons = 17.26 mpg! Quote Link to comment
datzenmike Posted September 29, 2017 Report Share Posted September 29, 2017 Reasonable. Anyone can get 10% better mileage simply by obeying the speed limit. Don't warm up your engine. Start, get comfortable, put seat belt on and drive. Engines do not need to be warmed up. If your vehicle runs like shit cold that's your fault. Keep tires inflated as close to maximum that comfort will allow. Drive, knowing that every time you have to use your brakes you are throwing away the gas you just used to get your vehicle up to that speed. Anticipate traffic and stops up ahead. Don't be in a hurry. Leave 3 min earlier and relax, driving is fun. It takes will but with practice it can be done. 1 Quote Link to comment
mx71 Posted September 29, 2017 Author Report Share Posted September 29, 2017 Thanks for the driving lesson! I don't necessarily care what mileage it gets, I was just worried that the supposed bad mileage I was getting before I found the correct tank size was indicative of a problem. This isn't my daily driver, just my run around/something to screw with truck. Also, the truck does need to be warmed about for a couple minutes at least. It has zero oil pressure when it first starts, and I'm not driving it until the oil pressure has climbed somewhat. Pretty aggressive response dude, but thanks for the tips. 1 Quote Link to comment
racerx Posted September 29, 2017 Report Share Posted September 29, 2017 Put it this way, if you got 20 miles a gallon back in the days, lets just say60s and 70s, you were king. American cars with their big V8 was prolly getting 10 or 12 miles a gallon. 1 Quote Link to comment
Knugcab Posted September 29, 2017 Report Share Posted September 29, 2017 I guess you have to be quite satisfied then for a gasser, I get around 16 mpg in my 4x4 diesel, so..... 1 Quote Link to comment
mx71 Posted September 29, 2017 Author Report Share Posted September 29, 2017 Pretty happy about it, yeah! Gets better mileage than my daily driver. Quote Link to comment
datsunaholic Posted September 29, 2017 Report Share Posted September 29, 2017 One of these days I'll figure out the mileage my '82 720 4X4 gets. The speedometer only works occasionally (the odometer works all the time, but I keep resetting the trip odometer because that sometimes makes the speedo work again). Or I could get another notebook and just write it down. I've been getting close to 200 miles a fill up, I think, as I live 50 miles from where I volunteer and get 2 trips. Not sure though. My Pathfinder gets 350 miles a tank (and once, when the cruise control broke, over 400 due to the vacuum leak!) for an average around 20mpg. So it's odd that the 720, being lighter with a smaller engine, gets such bad mileage but then again EFI vs Carb. My '83 2WD 720 regularly got over 25MPG. 1 Quote Link to comment
datzenmike Posted September 29, 2017 Report Share Posted September 29, 2017 Thanks for the driving lesson! I don't necessarily care what mileage it gets, I was just worried that the supposed bad mileage I was getting before I found the correct tank size was indicative of a problem. This isn't my daily driver, just my run around/something to screw with truck. Also, the truck does need to be warmed about for a couple minutes at least. It has zero oil pressure when it first starts, and I'm not driving it until the oil pressure has climbed somewhat. Pretty aggressive response dude, but thanks for the tips. Aggressive? Hardly... 17+ MPG IS reasonable. Tips would easily get you into the 20s. It was posted for anyone reading and would work for them also. Oil pressure is almost instantaneous. It's the gauge that reads slowly. Just like the gas tank reading when the key is turned on, it's not instant. So you don't have to wait for the reading to come up. Idling when cold with the choke on just wastes gas. It will warm up as fast or faster idling down the street and you're getting somewhere. 1 Quote Link to comment
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