[Healeys] fuel consumption

[llennep at verizon.net]

Thanks Bob.  Useful info.
Sent: Sun, Jul 3, 2022 11:17 am
Subject: Re: [Healeys] fuel consumption

 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:
  
 
 _filtered {} _filtered {}#yiv4316669477 p.yiv4316669477MsoNormal, #yiv4316669477 li.yiv4316669477MsoNormal, #yiv4316669477 div.yiv4316669477MsoNormal {margin:0cm;font-size:11.0pt;font-family:"Calibri", sans-serif;}#yiv4316669477 span.yiv4316669477EmailStyle17 {font-family:"Calibri", sans-serif;color:windowtext;}#yiv4316669477 .yiv4316669477MsoChpDefault {font-family:"Calibri", sans-serif;}#yiv4316669477 div.yiv4316669477WordSection1 {} 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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