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A friend and I used to take a long road trip--up to 5,000 miles--in my
BJ8 every year for over 20 years. He checked our mileage at every fuel
stop--useful if your gas gauge goes on the fritz--and I checked the
odometer against the roadside markers (it was spot on). Through three
engines the mileage stayed very nearly the same: 15MPUSG in stop-and-go
city driving, best I got was 25 on 'slow' (55MPH), flat highway driving
(eastern Oregon, when the troopers used to enforce it) and at freeway
speeds (70-75MPH) I got around 18. When I went from the 3.9 rear end to
a 3.54 I expected a mileage 'bonus,' but at most I got a tenth or two
better MPG.
29.6 miles per USG is extraordinary; these conversations come around
every few years and no on ever claimed much more than I was getting.
On 7/2/2022 8:48 PM, m.g.sharp@sympatico.ca wrote:
>
> Hi listers, As you might recall, I just had the engine rebuilt on my
> BT7 last year. I only have 670 miles on it so far. My fuel
> consumption seems exceptionally high. I have just checked on one fill
> up, and need to repeat to be more certain, but on the last tank I got
> an awful 10.1 miles to the Imperial Gallon (14.8 miles/US gal). I
> used to get about double that.
>
> I have checked the tune on the carbs using the usual method and
> checked it with a quick plug check (I have yet to do a proper plug
> chop), and if anything I think I am running a bit on the lean side.Â
> The exhaust seems good, just rich when the choke is on, however the
> engine does â??huntâ?? a little when at idle. It runs beautifully
> otherwise. No fuel leaks at all.
>
> My questions:Â 1) what are others getting for fuel consumption? And 2)
> any thoughts on how to improve it?
>
> Thank all - Mirek
>
>
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A friend and I used to take a long road trip--up to 5,000 miles--in
my BJ8 every year for over 20 years. He checked our mileage at every
fuel stop--useful if your gas gauge goes on the fritz--and I checked
the odometer against the roadside markers (it was spot on). Through
three engines the mileage stayed very nearly the same: 15MPUSG in
stop-and-go city driving, best I got was 25 on 'slow' (55MPH), flat
highway driving (eastern Oregon, when the troopers used to enforce
it) and at freeway speeds (70-75MPH) I got around 18. When I went
from the 3.9 rear end to a 3.54 I expected a mileage 'bonus,' but at
most I got a tenth or two better MPG.<br>
<br>
29.6 miles per USG is extraordinary; these conversations come around
every few years and no on ever claimed much more than I was getting.
<br>
<br>
<br>
<div class="moz-cite-prefix">On 7/2/2022 8:48 PM,
<a class="moz-txt-link-abbreviated"
href="mailto:m.g.sharp@sympatico.ca";>m.g.sharp@sympatico.ca</a> wrote:<br>
</div>
<blockquote type="cite"
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<div class="WordSection1">
<p class="MsoNormal">Hi listers, As you might recall, I just
had the engine rebuilt on my BT7 last year. I only have 670
miles on it so far. My fuel consumption seems exceptionally
high. I have just checked on one fill up, and need to repeat
to be more certain, but on the last tank I got an awful 10.1
miles to the Imperial Gallon (14.8 miles/US gal). I used to
get about double that.<br>
<br>
I have checked the tune on the carbs using the usual method
and checked it with a quick plug check (I have yet to do a
proper plug chop), and if anything I think I am running a bit
on the lean side. The exhaust seems good, just rich when the
choke is on, however the engine does â??huntâ?? a little when at
idle. It runs beautifully otherwise. No fuel leaks at
all.<o:p></o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal">My questions:Â 1) what are others getting
for fuel consumption? And 2) any thoughts on how to improve
it?<o:p></o:p></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal">Thank all - Mirek<o:p></o:p></p>
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<br>
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