700R4 ratios

[George M. Dailey]

Well, it seems as if the EFI SBC delivers a wide range of fuel economy 12 -
25mpg. I like Peter F's milage, so I'm going to adjust the timing to 14
deg,. BTDC. What is the provable milage that the '89 TPI cars could
routinely achieve? BTW Pete, what's your tire size and gear ratio? It may be
time for me to change.

Tom C. asked, "did the mpg drop occur suddenly or gradually ??  remember that
a worn engine is less efficient and will get less mpg as
it ages"

It dropped right after I replaced my 350HT with the 700R4. No other changes
period. No new big boned gilfriend, no doubble rations of food.

It's strange that some people get 20mpg routine and others think "Not even
the factory
thinks they get 15MPG city/ 24 MPG highway." I have noticed that those that
get the high milage swear by it as do those with the gas hoggs. The truth is
an elusive quarry! Could the differences be due to just a few small things
like a highly tuned EFI system? Back when I ran carbs, everybody got 8mpg
city and 12 highway with a SBC and that's all I have to say about that.

Thanks for the input gentlemen, I'll let you know what the timing does.

GMD


At 10:02 AM 7/16/97 -0500, you wrote:
>
>>> yeah, but a '93 Continental doesn't weigh 5600 pounds dry,
>>> like my '95 'burban with TBI and it probably doesn't have
>>> a 350 CID engine.  I'm running 16" tires and 3.73 rear end.
>>> It's 4WD also.  I record every drop of petrol that goes into
>>> it and after 40,000 miles, many on good highway runs, I'd
>>> love to know how to get 15 mpg
>>> 
>>
>>My 88 Chevy fullsize p/u has the same gears and really tall tires.  I get
>>17 or better on the highway -- have sen 22 - and 12 to 15 around town.  
>
>we're probably straying slightly from the forum content,
>but 5600 pounds weighs more than your pu loaded to its
>max (assuming it's a 1/2 ton) -- 4000# + 1000# = 5000#.
>Imagine what mpg you'd get if you drove it fully loaded
> ** all the time **  ..... and then add 600 more pounds,
>plus occupants ... and other paraphernalia -- up to another
>1/2 ton [the 'burban weighs 5600# ... dry, no fuel, no
>occupants, no nothing -- not even floor mats  ;-)  ]
>
>Tom Cloud <cloud at peaches.ph.utexas.edu>
>
>
George M. Dailey
gmd at tecinfo.com