[Healeys] fuel consumption

[Bob Spidell]

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 at 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.  
> The exhaust seems good, just rich when the choke is on, however the 
> engine does “hunt” a little when at idle.  It runs beautifully 
> otherwise.  No fuel leaks at all.
>
> My questions:  1) what are others getting for fuel consumption? And 2) 
> any thoughts on how to improve it?
>
> Thank all - Mirek
>
>
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