39 MPG!

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moose60
Posts: 168
Joined: 13 years ago
Location: Seattle WA

39 MPG!

#1

Post by moose60 » 13 years ago

Just to brag,
My last 280 mile round trip from Seattle to Marblemount/Cascade Pass trailhead burned 7.1 gallons of B60. I drove on I-5, and secondary highways, with a significant amount (45mi) on steep/twisty/gravel roads in third gear. On the highway, aside from trafic jams in Everett, I drove 55-65.
Yay!
Byron

82 Datsun 720 KC SD22

MPG Machine

ocd
Posts: 69
Joined: 13 years ago
Location: Portland, OR

#2

Post by ocd » 13 years ago

thats great! :D
-Noah

i deliver blends of biodiesel -no more!.

82 datsun 720 KC w/sd22
85 volvo 760gle sedan turbo diesel
85 peugeot 505s wagon turbo diesel & parts car
83 chevy k20 suburban silverado 6.2 n/a diesel

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philip
Posts: 1494
Joined: 14 years ago
Location: Southern California, USA

Re: 39 MPG!

#3

Post by philip » 13 years ago

moose60 wrote:Just to brag,
My last 280 mile round trip from Seattle to Marblemount/Cascade Pass trailhead burned 7.1 gallons of B60. I drove on I-5, and secondary highways, with a significant amount (45mi) on steep/twisty/gravel roads in third gear. On the highway, aside from trafic jams in Everett, I drove 55-65.
Yay!
Hmmm. A new definition for the High Miler Club! :wink:

Speaking of "high miles", how many miles on your engine/truck and what engine tune-up work has been done?
-Philip
Passed 08May2008
My friend, you are missed . . .

1982 Datsun 720KC SD-22

"Im slow and I'm ahead of you"

moose60
Posts: 168
Joined: 13 years ago
Location: Seattle WA

#4

Post by moose60 » 13 years ago

Philip-
My truck has about 140k miles. After I got it a couple of months ago I, changed the trans and diff to full synthetic fluid, replaced the thermostat so that the truck would reach operating temp(and coolant flush), adjusted valves, change half of the fuel lines to BioD compatable, and aired up the tires to 35 psi. Oh, I almost forgot, I applied "super aerodynamic" blue paint from a rattle can shortly after purchase. Looks pretty good.

This is what will make you think I'm nuts. After getting that great economy, I pulled the injectors(!) to try to fix my cold start smoke show. On the bench the injectors displayed initial stickyness and very poor spray pattern, improving with more fuel cyled through, but the pintle would still hang up occasionaly. I got 'em renozzled, and this morning...NO SMOKE!!(almost) on startup.

I should mention, in the spirit of full disclosure, that I drive like the poverbial grandmother. I'm that guy who everybody is cussing at as I milk the truck away from the stop light. I have found this to make the biggest difference in fuel economy (aside from mechanical problems), simply accelerating gently.

I did run into some confusion about the correct sealing washers for SD22 injectors, the information posted here was very helpfull. The rebuild was $230 at H and H diesel in Milton, they seemed to have the best rates in the Seattle area and did the work in two days.

Contact info forH&H Diesel
Byron

82 Datsun 720 KC SD22

MPG Machine

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asavage
Site Admin
Posts: 5346
Joined: 14 years ago
Location: Duvall, Wash.
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#5

Post by asavage » 13 years ago

moose60 wrote:. . . changed the trans and diff to full synthetic fluid . . .
:D
I should mention, in the spirit of full disclosure, that I drive like the poverbial grandmother.
I bet I'm slower than you :wink:
I drive using cruise control everywhere, and I set it at the speed limit. Really pisses people off.
Regards,
Al S.

1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.

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philip
Posts: 1494
Joined: 14 years ago
Location: Southern California, USA

#6

Post by philip » 13 years ago

moose60 wrote:SNIP I'm that guy who everybody is cussing at as I milk the truck away from the stop light. I have found this to make the biggest difference in fuel economy (aside from mechanical problems), simply accelerating gently. SNIP
Rather than see white knuckles and gritted teeth behind me, I go for a little humor. I want to believe most people can put together Datsun / Diesel / "Over the Hill" and get a laugh.

Image
Last edited by philip 13 years ago, edited 1 time in total.
-Philip
Passed 08May2008
My friend, you are missed . . .

1982 Datsun 720KC SD-22

"Im slow and I'm ahead of you"

User avatar
philip
Posts: 1494
Joined: 14 years ago
Location: Southern California, USA

Re: 39 MPG!

#7

Post by philip » 13 years ago

moose60 wrote:Just to brag,
My last 280 mile round trip from Seattle to Marblemount/Cascade Pass trailhead burned 7.1 gallons of B60. I drove on I-5, and secondary highways, with a significant amount (45mi) on steep/twisty/gravel roads in third gear. On the highway, aside from trafic jams in Everett, I drove 55-65.
Yay!
Friday (8/25). 630 mile round trip to Oatman, AZ.

I-15 to Hesperia truck stop: 93 miles / 2.5 g.
(no a/c, Cajon Pass to 4,400 feet, 60 mph)
I-15, I-40 to Needles: 198 miles / 4.9 g.
(no a/c, down hill to Needles (900 ft), 60 mph)
I-40, AZ95, Oatman, return home same route: 348 miles / 9.7 g.
(A/C, headwind, altitude climb, 65 mph)

Much of the return trip experienced ambient temperatures above 100 degrees. 108 in Needles.

Home to Needles: 39.3
Needles/Oatman/Home: 35.8

Diesel #2

Image
Last edited by philip 12 years ago, edited 1 time in total.
-Philip
Passed 08May2008
My friend, you are missed . . .

1982 Datsun 720KC SD-22

"Im slow and I'm ahead of you"

User avatar
philip
Posts: 1494
Joined: 14 years ago
Location: Southern California, USA

Re: 39 MPG!

#8

Post by philip » 13 years ago

Delivered medium portable generator out to Palmdale.

Topped off fuel in Anaheim.

Hwy 57n / 210w / I-5n / Hwy 14n Palmdale (delivery)
Hwy 138e / I-15s / I-215s / Rt 91w Anaheim (finish, refuel)

240 mi / 5.8 gallons. 41.3 mpg

Never exceeded 60 mph. Am experimenting with IP settings and warm air intake.
-Philip
Passed 08May2008
My friend, you are missed . . .

1982 Datsun 720KC SD-22

"Im slow and I'm ahead of you"

moose60
Posts: 168
Joined: 13 years ago
Location: Seattle WA

Fuel Economy

#9

Post by moose60 » 13 years ago

I took several trips around the Puget Sound (Vancouver Island, Southern Oregon etc.) region in the late summer, and the truck returned between 37.5 and 41.25 MPG. I had two consecutive tanks above (barely) 40 MPG, with an average around 39 on petrodiesel, and about 37.5 MPG on biodiesel. Even with the price of diesel exceedng gasoline, even premium, this is an efficient little pickup. My other Asian pickups have given 25-31 MPG on gasoline.

Byron
Byron

82 Datsun 720 KC SD22

MPG Machine

zen
Posts: 118
Joined: 13 years ago
Location: london uk

#10

Post by zen » 13 years ago

sd33 turbo..averages 22mpg...
turbo it

(sd33t home turbo set up if anyone is interested..)

redmondjp
Posts: 204
Joined: 14 years ago
Location: Redmond, WA

#11

Post by redmondjp » 13 years ago

zen wrote:sd33 turbo..averages 22mpg...
But that's using Imperial gallons, correct?

1 Imperial gallon = 1.2 US gallon

Using this correction, 22 mp(imperial)g gives 18.3 mp(us)g

This seems low to me . . .
1982 Datsun 720 King Cab, SD22, 86K miles (sold)
1981 Rabbit LS 4-door, 1.6D, 130K miles (sold)
1996 Passat TDI 4-door sedan, 197K miles

zen
Posts: 118
Joined: 13 years ago
Location: london uk

#12

Post by zen » 13 years ago

yep
turbo it

(sd33t home turbo set up if anyone is interested..)

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philip
Posts: 1494
Joined: 14 years ago
Location: Southern California, USA

#13

Post by philip » 13 years ago

zen wrote:sd33 turbo..averages 22mpg...
18.3 US MPG ... for a 198 cid diesel. You own oil stock? :)
-Philip
Passed 08May2008
My friend, you are missed . . .

1982 Datsun 720KC SD-22

"Im slow and I'm ahead of you"

ocd
Posts: 69
Joined: 13 years ago
Location: Portland, OR

#14

Post by ocd » 13 years ago

most recent fillup getting 28.15 mpg -almost all short trips under 1/2 hr of driving.
-Noah

i deliver blends of biodiesel -no more!.

82 datsun 720 KC w/sd22
85 volvo 760gle sedan turbo diesel
85 peugeot 505s wagon turbo diesel & parts car
83 chevy k20 suburban silverado 6.2 n/a diesel

RMP&O
Posts: 12
Joined: 13 years ago
Location: Jackson Hole, WY
Contact:

#15

Post by RMP&O » 13 years ago

redmondjp wrote:
zen wrote:sd33 turbo..averages 22mpg...
But that's using Imperial gallons, correct?

1 Imperial gallon = 1.2 US gallon

Using this correction, 22 mp(imperial)g gives 18.3 mp(us)g

This seems low to me . . .
That is about what I am getting. Last time I checked it was about 28k's per gallon which I think is about 18mpg.

What can I say....the SD33 is old and tired and in need of my hard earned $$. :roll:
83 MQ Patrol - SD33

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