Porsche Posted November 30, 2012 Report Share Posted November 30, 2012 Hey guys. I'm new here and don't actually own a Datsun. But I've been looking for a car that gets better gas mileage than mine for going to and from school. I've heard a couple different times that some Datsun get amazing MPG. I heard from one place that the Datsun 620 (I think thats the one?) pickup can get up to 45 MPG, one friend told me his sons got 55 MPG. I doubt either of those are accurate but I dont know. Anyway could any one tell me what kind of mileage this pickup gets? Quote Link to comment
datsunaholic Posted November 30, 2012 Report Share Posted November 30, 2012 25 is usually a pretty good number. I've gotten low-mid 30s with some fairly simple but concerted modifications, but have never been able to reproduce that. 45 and 55 are fantasy. Even the B210 that was rated at 50 couldn't reliably get that. 1 Quote Link to comment
darrel Posted November 30, 2012 Report Share Posted November 30, 2012 When I was curious about gas mileage on my 620 before I had a chance to check. I searched the archives. "620 gas mileage" It came up with avg results. When I got around to using up a tank of gas on my own, '79 620 kc l20b, with 4 spd and stock carb, I got 23.7 mpg with combination hwy and city driving. The only gasser vehicle that I have driven that got reliable 45 mpg was the toyota starlet, carbed version. That was a fun little car. I drove it to CA and back to CO in the early 80's. Quote Link to comment
KhausticMess Posted November 30, 2012 Report Share Posted November 30, 2012 I read a bunch of differant ratings on what they are capable of and they never get anywhere near whats listed. for example a 720 pickup has been listed at 30+ on a bunch of sites i have found and they rarely get more than 25 from what I've read on this site, mine personally gets roughly 20. Quote Link to comment
DISLEXICDIME Posted December 1, 2012 Report Share Posted December 1, 2012 My 720 gets 25 with me driving and 30 when my wife drives it Quote Link to comment
metalmonkey47 Posted December 1, 2012 Report Share Posted December 1, 2012 I average about 25 mpg around town in my 620, but I'm really light on the foot. Lately been doing around 20mpg carrying a little extra weight. My old 210 did as good as 40 MPG with a Weber carb, which was amazing. Quote Link to comment
datsunaholic Posted December 1, 2012 Report Share Posted December 1, 2012 With the 720 various ratings are explainable; there were different engine options. My '83 720 got very close to 30, which was very good considering the truck weighed more, had power steering, and a nearly 25% larger engine by displacement. 620s never had anything but one engine per model year. '79s with a 5-speed would theoretically get the best mileage, at least in stock form, due to the 4.11 outweighing the slightly lesser overdrive. But you're still moving the same amount of weight the same speed. Savings come from constant-speed cruising. The 400 RPM drop of the (stock) 5-speed over 4th gear saves energy only in the rotating mass of the engine. My high-MPG (low-mid 30s) truck had a nearly 800 RPM drop due to the modification of using a late 280ZX 5-speed, a very lean Weber carb, and an L18 engine which of course had less stroke and overall weight than the original L20B. But it wasn't going to set any acceleration records, that's for sure. Quote Link to comment
herculesinwyoming Posted December 1, 2012 Report Share Posted December 1, 2012 If you run a 620 at the 55 speed limit of the 70's it will get 35 mpg i bet. Quote Link to comment
datzenmike Posted December 1, 2012 Report Share Posted December 1, 2012 I had a new '76 B-210 4 speed and drove cross Canada a year later. I got almost 50MPG a couple of times but usually low/mid 40s on the highway. I lived on a farm 11 miles from town so the average MPG at home was always in the 30s.Our Imperial gallons are 1.2 of your US gallons. Cross Canada in my 620 I used to get 27-29MPG which is mid 20s for a US gallon.. Mileage is a function of speed and front section area. (air resistance) vehicle weight and hills to climb, stop and go traffic, engine size. Every time you use your brakes you are wasting the gas just used to accelerate the mass of your vehicle up to speed. What's the hurry? Leave sooner and go the speed limit. Wind resistance is 4 times as much at 80 as it is at 40MPH. Stop warming your vehicle up. Start it and drive away within 20 seconds. If it runs like shit when cold then it's cheaper to fix that, then the gas you waste. 1 Quote Link to comment
hUmBoLdT_HooV Posted December 1, 2012 Report Share Posted December 1, 2012 My 510 gets low 30's with a L16 and a 79 z 5 speed.. shitty for hills but cruising flat roads it does fine. Quote Link to comment
510Craven Posted December 1, 2012 Report Share Posted December 1, 2012 I have a 74 620, lowered 3", stock l18 carb and four speed and get a very consistent 22 mpg. Of course my speedo is off by 5 mph so not sure if that calculates for the better or worse. Best Iv got was 23 but as datzenmike mike stated I waste a little gas warming it up as I have to pump the gas pedal just to get her started then hold the rpms up to get it warm. I also commute on the freeway 60 miles a day, drive between 65-70 mph, and haven't changed spark plugs or made any carb adjustments since I got it. Still better then my f150 Quote Link to comment
converted_to_datsun Posted December 1, 2012 Report Share Posted December 1, 2012 In my 79 620 L20b with a 5 speed and stock carb I get around 24 or 25 all around driving. I put my foot in it sometimes so I could probably get better Quote Link to comment
Jdm720 Posted December 1, 2012 Report Share Posted December 1, 2012 My 720 gets approximately 20mpg... and haven't changed spark plugs or made any carb adjustments since I got it. Still better then my f150 Shhhit that's what I gotta do.. Haven't changed my spark plugs either, but I have eight of those little fuckers... Quote Link to comment
angliagt Posted December 1, 2012 Report Share Posted December 1, 2012 I had a '72-1/2 Toyota Hilux (RN22) back in the early '70's. 25 MPG was the best,honest gas milage that you could get from them. Remember - most had low rear end ratios (4:11),so that limited things. Of course,there's always the guy who will tell you that he got 50 mpg, while towing a fully loaded trailer @ 65 mph - "No Lie". - Doug Quote Link to comment
Ranman72 Posted December 1, 2012 Report Share Posted December 1, 2012 my stock tired L16 in my 510 got 24 to 25 with a 32/36 dgv weber carbalmost no mater how I drove it with my built L20 duel 40 webers and driving it like I stole it (because that is how your supposed to drive it ) I get about 17 keep in mind I still have to fine tune the jetting on the carbs BUT it is much more fun to drive than the 24 MPG L16 Quote Link to comment
qwik510 Posted December 1, 2012 Report Share Posted December 1, 2012 My 95 Hardbody with KA and auto trans gets horrible mileage. It averages around 22mpg. I have gotten 25 with all Hwy driving if I keep it under 70. I think the auto trans sucks up way more fuel then a manual. I would like to swap in a 5 speed but have never gotten around to it. Quote Link to comment
Radim Posted December 1, 2012 Report Share Posted December 1, 2012 Cammed engine, Dual Sidedrafts, Dogleg, and 4.3 gearing 15/55s I get roughly 14-18 MPG.... =/ 1 Quote Link to comment
datzenmike Posted December 1, 2012 Report Share Posted December 1, 2012 My 95 Hardbody with KA and auto trans gets horrible mileage. It averages around 22mpg. I have gotten 25 with all Hwy driving if I keep it under 70. I think the auto trans sucks up way more fuel then a manual. I would like to swap in a 5 speed but have never gotten around to it. Heavier truck and larger motor. Quote Link to comment
FoxyRoadster Posted December 1, 2012 Report Share Posted December 1, 2012 I had a new '76 B-210 4 speed and drove cross Canada a year later. I got almost 50MPG a couple of times but usually low/mid 40s on the highway. I lived on a farm 11 miles from town so the average MPG at home was always in the 30s.Our Imperial gallons are 1.2 of your US gallons. Cross Canada in my 620 I used to get 27-29MPG which is mid 20s for a US gallon.. Mileage is a function of speed and front section area. (air resistance) vehicle weight and hills to climb, stop and go traffic, engine size. Every time you use your brakes you are wasting the gas just used to accelerate the mass of your vehicle up to speed. What's the hurry? Leave sooner and go the speed limit. Wind resistance is 4 times as much at 80 as it is at 40MPH. Stop warming your vehicle up. Start it and drive away within 20 seconds. If it runs like shit when cold then it's cheaper to fix that, then the gas you waste. This! I know on my non EFI cars longest I'd let them warm up is about a minute to 2 minutes and that was so I wasn't driving around with my oil pressure on my VW through the roof. Quote Link to comment
HRH Posted December 1, 2012 Report Share Posted December 1, 2012 My old '97 2wd standard cab hardbody, manual trans got an average 21 mpg around town. It could get 23ish on the highway, if I kept it at 50mph, I got 26 mpg. That's pretty average. The current KAZ24 ext, cab hardbody 4x4 averages 18.5-20 around town in the summer. In winter it's about 17.5-18.5 depending on weather conditions. Summer highway I've gotten as high as 22.7 mpg, but has to be no wind. Winter highway is 20-21. Neither of these trucks has a camper shell, which will help. My Datsun guru is getting around 25 mpg in his 93 ext. cab hardbody 2wd with camper shell. He's annoyed by that mileage even, which realistically is good for the weight of the vehicle. Most Datsuns with L20s with webers (trucks) have gotten around 18-20 mpg. Granted the rear gears on 620s are pretty steep. Oh, and if I let the truck fully warm up on cold days, that translates to 15-16.5 mpg. Which is why generally I start it, wait for oil pressure, then back it out and go. Except on really frigid days,then I'll sacrifice the mileage. Out at the ORV park, it's not uncommon for me to get 7-12 mpg with the truck. ;) Funny how sand and 4 wheel drive do that to you. Of course, you could drive a brand new Frontier with that stupid 4 liter and get 15 and 20 mpg city to highway. Blech. They need to put the 3.5 liter back into the Frontiers. They still have it in the Pathfinders, it would only drop 25 hp, and would still have plenty of get up. Then make a manual locking hub version instead of the always on ones. It's no wonder no one wants to buy a compact pickup anymore. Might as well get the V8 Titan, it doesn't get that much worse mileage than the V6 Frontier. And the 4 cylinder Frontiers don't get much better than the hardbodies do. I thought we were going ahead in technology, not behind? Quote Link to comment
Dat Lurka Posted December 1, 2012 Report Share Posted December 1, 2012 My 620 KC gets about 23 mpg and is usually floored. That's with a leaky carb and worn rings. Quote Link to comment
bilzbobaggins Posted December 1, 2012 Report Share Posted December 1, 2012 70 521 L16 weber 32/36 ei dizzy gets around 25 to 28 ish. My 96 Hardbody 4x4 gets 16 mpg, but speedo is off due to the 31's. Need to get correct drive gear for her. Quote Link to comment
datzenmike Posted December 1, 2012 Report Share Posted December 1, 2012 Stock 4x4 P235/75R15 or 28.88" diameter and 90.72 circumference. A 31" tire is 97.34" around... or you go 7.3% further. This only adjusts your mileage to just above 17MPG. Quote Link to comment
banzai510(hainz) Posted December 1, 2012 Report Share Posted December 1, 2012 your avatar says you got a Porche 928 (v8) who cares about gas milage your rich if you get 25 your doing really good as a daily driver(real world city) Quote Link to comment
Laecaon Posted December 1, 2012 Report Share Posted December 1, 2012 I work on trucks, almost exclusively, every time I pull a new truck in and it has a readout of its avg gas mileage I remember that and then look to see what engine it has. The 2 highest numbers to come into the shop. 22.7mpg and 22.3mpg. And who wants to guess what trucks these were? The first one was a 2011 2500 Ram Crew Cab with a Cummins diesel in it. The second one was a 2012 1500 Crew Cab VBed Ram with the Hemi in it. Lowest mpg I have seen (mind you I know there has been lower but this is only trucks with digital read outs) was a 09 Ford Ecoboost, and it was at 9.6mpg. Now I will say this is 4 mpg lower than any other Ecoboost I have seen. Some of these numbers in this thread make me cringe. Quote Link to comment
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