Enjoy 5% OFF at VEVOR Canada! and Support Canadian Poncho at the Same Time!
Members Login
Username 
 
Password 
    Remember Me  
Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Power Train Tech Forum -> Fuel economy on 327/Powerglide
Post Info TOPIC: Fuel economy on 327/Powerglide
Neilvermilion


Addicted!

Status: Offline
Posts: 287
Date:
Fuel economy on 327/Powerglide
Permalink  

Hey there, just finally depleted my first full tank on my Parisienne and it raised a question - is 43 l/100km normal fuel economy for the car? No burnouts, just slow cruises, however the car was shipped with trucks and trains and i don't know what they were doing there.

Also which gas are people use nowadays as all gas are ethanol now? Am i ok to use mid grade + ethanol treatment fluid?

Thanks



__________________

1965 Parisienne Custom Sport

Burlington, ON
1965CS


Guru

Status: Offline
Posts: 926
Date:
Permalink  

Neilvermilion wrote:

Hey there, just finally depleted my first full tank on my Parisienne and it raised a question - is 43 l/100km normal fuel economy for the car? No burnouts, just slow cruises, however the car was shipped with trucks and trains and i don't know what they were doing there.

Also which gas are people use nowadays as all gas are ethanol now? Am i ok to use mid grade + ethanol treatment fluid?

Thanks

 That seems horrible. I could be wrong, but I think the liters should be about 1/3 of that. I don't know the liters per KM, but mine gets 20+ per imperial MPG.



__________________

65 Custom Sport Convertible

Southern Alberta
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
Neilvermilion


Addicted!

Status: Offline
Posts: 287
Date:
Permalink  

ouch!

__________________

1965 Parisienne Custom Sport

Burlington, ON
Canadian Poncho


A Poncho Legend!

Status: Offline
Posts: 27395
Date:
Permalink  

That's 5mpg. Something isn't right. Perhaps a brake dragging?

__________________

Todd
Site Founder

Like us on Facebook. http://www.facebook.com/CanadianPoncho

Canadian Poncho World Headquarters - Prince Edward Island

 
CdnGMfan


Canadian Poncho Superstar!

Status: Offline
Posts: 4956
Date:
Permalink  

Timing, spark(s), fuel (is it rich?), air filter, leaks, brake drag. Your car, if running on spec should do much better. How tired is the engine? Compression test? Stuck rings, sticky float, worn out camshaft...

Looking at a road test of a 1967 Impala in a Popular Mechanics mag the reported fuel consumption averaged 13.2 U.S. MPG city, 16.1 U.S. MPG highway. It was reported the same by owners whether 283 & 327! Imperial gallon is 20% larger so 15.84 mpg Imperial city, 19.34 mpg Imperial highway. It is a long way from 5 mpg.

__________________

67 Chevelle Malibu Sport Coupe, Oshawa-built 250 PG never disturbed.

In garage, 296 cid inline six & TH350...

Cam, Toronto.


I don't judge a man by how far he's fallen, but by how far back he bounces - Patton
66 Beau


Poncho Master!

Status: Offline
Posts: 1855
Date:
Permalink  

Stuck choke?

__________________

_______________________________________
==|====|----B-E-A-U-M-O-N-T----|====|==

\__________________|________|____________________/

__\____O__________________|66BEAU|___________________O____/
oshawacliff


Poncho Master!

Status: Offline
Posts: 2252
Date:
Permalink  

when I managed a tire shop we sold an engine flush product.  First remove all spark plugs and test compression.  Record compression and then add a chemical flush product to the dirty oil and run for 10 minutes.

Drain the oil, remove the spark plugs and retest compression. 

Refill with fresh oil and add another chemical in the gas tank and check fuel mileage after the procedure. 

Princess auto and ctc sells a variety of chemicals for such a purpose.

Cliff



__________________

Cliff

Done Hurryin

Like the larger type for my eyes. 

 

 
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
oshawacliff


Poncho Master!

Status: Offline
Posts: 2252
Date:
Permalink  

Doing  this a couple of times during the season will give you a better assessment of the problem.  You might be able to squeak in a season and then do a full rebuild during the winter months.  You can also be saving up the cash for the rebuild.

Enjoy a trouble free summer and plan for the winter budget.

Cliff



__________________

Cliff

Done Hurryin

Like the larger type for my eyes. 

 

 
Neilvermilion


Addicted!

Status: Offline
Posts: 287
Date:
Permalink  

Got it, will be looking for a shop as soon as the car is re-registered.

__________________

1965 Parisienne Custom Sport

Burlington, ON
CdnGMfan


Canadian Poncho Superstar!

Status: Offline
Posts: 4956
Date:
Permalink  

What Cliff says has merit. Stuck rings can sometimes be freed up by what Cliff described. Not all cures in a can are useless. Does GM still sell the combustion chamber cleaner named "Cleans"?

Another thing to check: has the carb been messed with over the last few decades? Opinions differ but IMHO a bad rebuild is worse than no rebuild.

__________________

67 Chevelle Malibu Sport Coupe, Oshawa-built 250 PG never disturbed.

In garage, 296 cid inline six & TH350...

Cam, Toronto.


I don't judge a man by how far he's fallen, but by how far back he bounces - Patton
seventy2plus2


Canadian Poncho Superstar!

Status: Offline
Posts: 7787
Date:
Permalink  

The original note in this thread has me a bit stumped. The note contains "however the car was shipped with trucks and trains and i don't know what they were doing there".
Are you saying the car was filled before it was shipped, and now you've driven it to empty and it took x litres over x km? And suspect maybe fuel was burned / stolen / syphoned while being shipped?
Fill it up again, put some miles on it, and see how much it takes to refill it.

__________________
70 2+2 convertible
70 2+2 hardtop
70 Parisienne hardtop

 

 
Neilvermilion


Addicted!

Status: Offline
Posts: 287
Date:
Permalink  

There was a quarter tank, maybe a bit more. When I got it it was empty, I got to a gas station on fumes.

__________________

1965 Parisienne Custom Sport

Burlington, ON
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
seventy2plus2


Canadian Poncho Superstar!

Status: Offline
Posts: 7787
Date:
Permalink  

The bottom quarter tank burns pretty fast so you can't judge mileage from that. When you fill it to the brim it'll be way past full.

__________________
70 2+2 convertible
70 2+2 hardtop
70 Parisienne hardtop

 

 
unruhjonny


Guru

Status: Offline
Posts: 808
Date:
Permalink  

what would help us is knowing your gearing;
gearing should more or less point at what your target or ideal mileage should be at.

for period high performance cars, 9mpg wasn't out of the ordinary;
but for the more pedestrian drivetrains, you should be able to almost triple that...

__________________

1970 Formula 400
Carousel Red on black (std) interior
"no drivetrain option" car (same base drivetrain as GTO)
1:411 1970 Firebird Formulas originally sold in Canada

Luke 23: 39-43 / Ephesians 2: 8-9  / 1 Corinthians 2:12-14 / 2 Timothy 3:1-5;12
North


Guru

Status: Offline
Posts: 788
Date:
Permalink  

Interesting subject, since I have several big American Pontiacs (with very problematic cannister style fuel gauges) I got into the habit of keeping a listing on my phone of each fill up in all my Pontiac's with gallons (US), date and odometer reading. With this I've recorded mileage on many cars for years now. Most of my classic car driving is a mix of short suburban and longer country drives and easy on the car is my driving style here are some examples. Since it's hard to get the exact same fillup level every time I'm only posting the cars that have had many recorded fillups and I present the normal range. All have AC unless I say otherwise but I don't use AC much anyhow.

(all in miles per US gallon, multiply by 1.25 to get canadian mpg)

1... 69 LeMans ragtop, 350-330 HO, TH400, 2.93: 12-15
2... 69 GTO hardtop, 400-350 4bbl, M20, 3.23: 10-13
3... 69 Bonneville ragtop, 428-390 HO, th400, 3.42: 10-11
4... 69 Catalina ragtop, 428-360 4bbl, th400, 3.23: 10-12
5... 69 Executive 4dr sedan, 400-290 2bbl, TH400, 2.73: 11-14
6... 69 LeMans 4dr hardtop, 350-265 2bbl, TH400, 2.78: 11-15
7... 69 Firebird ragtop, 250-175 1bbl (OHC6), ST300 (2spd auto), 3.23, no AC: 14-16
8... 69 Catalina ragtop, 400-290 2bbl, TH400, 2.73, no AC: 12-14
9... 69 Firebird ragtop, 250-230 4bbl (OHC6), M20, 3.23, no AC: 13-15

These are all bone stock cars in good tune and are the typical mileage range. I have a 69 2+2 hardtop with the chevy 350-300 4bbl, TH350 and 2.73 no AC but I haven't used it enough to measure mileage but given it weighing less than Catalinas I'd guess it would be similar to the 350 HO LeMans mentioned above


__________________

John

Montreal 

29 1969 American Pontiacs

and a 1969 Canadian 2+2 Hardtop
Neilvermilion


Addicted!

Status: Offline
Posts: 287
Date:
Permalink  

mine's got 5 mpg if we convert it into the american system:) taking it to a shop tomorrow, will see what they find.

__________________

1965 Parisienne Custom Sport

Burlington, ON
poncho62


Poncho Master!

Status: Offline
Posts: 1067
Date:
Permalink  

Wouldn't be surprised if the advance in the distributer is seized up. Something to check.

__________________


Hanover, Ont

Ontario Rodders Forum
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
seventy2plus2


Canadian Poncho Superstar!

Status: Offline
Posts: 7787
Date:
Permalink  

Neilvermilion wrote:

mine's got 5 mpg if we convert it into the american system:) taking it to a shop tomorrow, will see what they find.

 What is the American system?  Are you using the US gallon (not the imperial gallon) in your calculations?



__________________
70 2+2 convertible
70 2+2 hardtop
70 Parisienne hardtop

 

 
Neilvermilion


Addicted!

Status: Offline
Posts: 287
Date:
Permalink  

American system is where they use mile, gallons and feet.
Just use Google to convert.
I'm using liters, miles from the dash, convert them to kms and calculate into L per 100 kms.

__________________

1965 Parisienne Custom Sport

Burlington, ON
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.
Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Power Train Tech Forum -> Fuel economy on 327/Powerglide
Tweet this page Post to Digg Post to Del.icio.us
.
Support Canadian Poncho!
Select Amount:
<
.
.
.