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Bluebird junky 10-16-2019 02:51 PM

86' bluebird Wanderlodge PT-38
Hello everyone;
Question of curiosity, what is the expected fuel consumption for a 86' PT-38 with a Detroit 8v92?.

Alfa 10-16-2019 03:43 PM


I see between 5 and 5.5, but my generator is almost always running and my engine fan is always on high. I am also a little heavier than you.


curtsprenger 10-16-2019 04:02 PM

What Diego said. Keep the speed down and get slightly better fuel mileage.

arcaidy 10-16-2019 04:23 PM

I have two less cylinders and a little less weight so my numbers probably aren't very useful for a guesstimate MPG, but I wanted to share what I found on how MPH affected my MPG. Its not insignificant.

In my 6v92 PT35 with the gen running this is what I estimate to get after a few trips trying different average speeds:

60 - 65 is around 7 MPG
65 - 70 is around 6 MPG
70 - 78 (governed speed) is around 5 or less...

I tested the different speeds to see how much more fuel I used with higher speeds. The thought was if I was near the same usage at 75 as I was at 65 I'd run the faster speed. Needless to say I slow it down now most of the time...

When I looked around I found different answers to fuel usage so I wanted to test it myself. It took a few long trips to figure it out, but glad I did it. You have to stay pretty steady with the speeds over the entire trip to get a good idea. My best was over 8 MPG but I don't believe it. I slight angle can make a big difference when filling up the tank!

I plan my trips at 5 MPG and be happy when it takes less than I expected to fill up. One interesting thing I found was towing appears to have little or no effect on MPG. I had close to 10K behind me at one point for a 800 mile trip and my MPG was the same as if I wasn't pulling anything. This was on mostly flat land.

Don Meyer 10-16-2019 04:44 PM

In our 18th year of ownership of 86 PT38 8V92. Consistently getting 5.5 MPG.
Cruising RPM 1600 to 1700. 60 to 63 MPH Pulling 10,000 lb trailer

Replaced original 9G90 injectors with larger 9G95.
No muffler.
Bigger air intake up top.
Tire pressure 115 in front 100 in all rears.

Bluebird junky 10-16-2019 05:47 PM

Thank you all for your reply. Well, I drive like IAM heading to the grocery store,I have a commercial license, so getting a ticket with a class "A" regardless if i'am driving class "C" I can't get the infraction removed from my record, so driving conservatively is a priority. At any rate, IAM expecting a possible 6+ mph At 55?.
IAM a newby here, been looking at and hopefully going to purchase an older gentleman PT-38 with 97,000 original mi Wanderlodge, just don't want to jump the gun and get into something that will get -6mpg . lol

Crit Bliss 10-16-2019 06:45 PM

Fuel is a small cost in ownership

Alfa 10-16-2019 08:50 PM


Originally Posted by Crit Bliss (Post 467446)
Fuel is a small cost in ownership



skywalker6582 10-16-2019 10:26 PM

Yep: Burn no fuel in the driveway, or 5.5 mpg on the road running the gennie, your choice:D

Gene Mehr 10-17-2019 12:06 AM

I just drove 2000 miles cost about 600 bucks, it's just a big toy have fun and feed it. Every time I figure out the milage it's the same. Like a fully loaded 1978 Ford truck

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