Blue78 Posted January 17, 2014 Report Share Posted January 17, 2014 What is your gas mileage. Looking for what your getting out of your 620 with L20b. My best is 22.5mpg with 91 Quote Link to comment
DanielC Posted January 17, 2014 Report Share Posted January 17, 2014 I have a 521, this truck. http://community.ratsun.net/topic/30606-my-ratsun-datsun-521/ I have been using it as a daily driver since August, 2013, and I am getting between 20.5 to 22 per gallon. 1 Quote Link to comment
Just Joel Posted January 17, 2014 Report Share Posted January 17, 2014 L20b, 38mm su's (tuned for performance not economy) l18 pistons with large valve closed head, 280z 5 speed mostly in town with little hwy, 91 octane... I'm getting 22mpg 1 Quote Link to comment
Guest Rick-rat Posted January 17, 2014 Report Share Posted January 17, 2014 24 mpg, 1600, weber carb, 620 Quote Link to comment
jrock4224 Posted January 17, 2014 Report Share Posted January 17, 2014 1971 Datsun 521 l20b .....z/l series 5 sp tranny .. one piece drive line ..3.88....18" wheels.,.,.. 22 on average ... but im in town a lot .,.. some days I get pretty heavy footed having a l20 now over the 1600......weber 32/36 needs jetted too but and I warm my truck up in the am for about 15 minutes with the choke on... Quote Link to comment
Fat510 Posted January 18, 2014 Report Share Posted January 18, 2014 I get around 20 with Hitachi carb "bigger bore" stock L20 intake, peanut head, z tranny with 3.90 gears on 185/60r14s. Since I use the freeway a lot now, any faster than 65 is like opening a floodgate Quote Link to comment
TENDRIL Posted January 18, 2014 Report Share Posted January 18, 2014 69 510 wagon L20b dual weber 40's a87 peanut with 280/480 cam dogleg stock goon diff 17ish highway Quote Link to comment
jser12 Posted January 18, 2014 Report Share Posted January 18, 2014 maybe my car is off...L20b, slight bore and mild camweber 32/36195/60/r144.11 gears ... I get about 26-28mpg doing 65-68ish Quote Link to comment
Blue78 Posted January 18, 2014 Author Report Share Posted January 18, 2014 Sounds like im getting about the normal millage thanks for all input. Quote Link to comment
TENDRIL Posted January 18, 2014 Report Share Posted January 18, 2014 maybe my car is off... L20b, slight bore and mild cam weber 32/36 195/60/r14 4.11 gears ... I get about 26-28mpg doing 65-68ish i used to get those numbers with my 32/36 Quote Link to comment
datzenmike Posted January 18, 2014 Report Share Posted January 18, 2014 What is your gas mileage. Looking for what your getting out of your 620 with L20b. My best is 22.5mpg with 91 I got about 32 on Imperial gallon that's just a hair under 26.6 MP(US)Gallon. Quote Link to comment
jrock4224 Posted January 18, 2014 Report Share Posted January 18, 2014 I get around 20 with Hitachi carb "bigger bore" stock L20 intake, peanut head, z tranny with 3.90 gears on 185/60r14s. Since I use the freeway a lot now, any faster than 65 is like opening a floodgate Lol I tried for a few tanks to stay out of the secondary's and it was a waste of effort .... And a leg cramp for 200 plus miles Quote Link to comment
jrock4224 Posted January 18, 2014 Report Share Posted January 18, 2014 I got about 32 on Imperial gallon that's just a hair under 26.6 MP(US)Gallon. maybe my car is off... L20b, slight bore and mild cam weber 32/36 195/60/r14 4.11 gears ... I get about 26-28mpg doing 65-68ish I want these kinda numbers Quote Link to comment
willz Posted January 18, 2014 Report Share Posted January 18, 2014 driving from seattle to san diego loaded up with everything I own in the bed... I averaged about 22-26mpg Quote Link to comment
Cpl620 Posted January 18, 2014 Report Share Posted January 18, 2014 L18 weber 4speed 620 about 20mpg on 89 Quote Link to comment
tr8er Posted January 18, 2014 Report Share Posted January 18, 2014 510 wagon l20b weber 38/38 aggressive cam automatic stock diff and wheels 24-26. Stock I was getting 29ish. 1 Quote Link to comment
wayno Posted January 18, 2014 Report Share Posted January 18, 2014 When I broke in my LZ23 in the 521 dually flatbed, I went to Renton WA from Vancouver WA, I got about 23mpg, I was all over the place though, going fast, going slow, going really fast(broke the speedo needle off), normally I am lucky to get 17mpg, I was surprised. One thing to keep in mind about me, I drive fast, so I averaged 17-19 mpg for years. Quote Link to comment
RTB Posted January 18, 2014 Report Share Posted January 18, 2014 As long as I do better than my Land Cruisers 16-17 I'll be happy, but if I were to guess I'll say once I'm all done I will get 19-20 Quote Link to comment
Komeuppance Posted January 18, 2014 Report Share Posted January 18, 2014 24mpg in my 2.6 Turbo 4cyl... normally cruising around 90-100, with a few speed bursts. -Robert 1 Quote Link to comment
Fat510 Posted January 18, 2014 Report Share Posted January 18, 2014 Lol I tried for a few tanks to stay out of the secondary's and it was a waste of effort .... And a leg cramp for 200 plus miles It really is, you have to open the secondarys to get in the powerband ...but the powerband is needed to keep up with traffic...its a vicious circle :lol: Quote Link to comment
MikeRL411 Posted January 19, 2014 Report Share Posted January 19, 2014 45 years ago, properly tuned for altitude, on my way from Great Falls Montana to San Bernardino, at 65mph my RL411 got 38 MPG [Engine efficiency meets drag coefficient], at sea level in city traffic since then, 20 MPG. That's with the Borg Warner 3 speed automatic transmission. Quote Link to comment
Mikeystoy Posted January 19, 2014 Report Share Posted January 19, 2014 75 A14 4sp 3.90 gets 27.5 driving 60. I was getting 31 in the summer. Quote Link to comment
datrod Posted January 19, 2014 Report Share Posted January 19, 2014 My wagon with an LZ23 and duel 45 webers, now gets GPM not MPG. Quote Link to comment
scooter stuff Posted January 19, 2014 Report Share Posted January 19, 2014 45 years ago, properly tuned for altitude, on my way from Great Falls Montana to San Bernardino, at 65mph my RL411 got 38 MPG [Engine efficiency meets drag coefficient], at sea level in city traffic since then, 20 MPG. That's with the Borg Warner 3 speed automatic transmission. Gas cost alot less 45 yrs ago. Quote Link to comment
bonvo Posted January 19, 2014 Report Share Posted January 19, 2014 on average my datto gets about 18 mpg in town on longer trips where im crusing i have gotten as high as 33 Quote Link to comment
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