700R4 ratios

[Dan]

21MPG in a 5,700lb suburban?!  I have a Tahoe and a Suburban
5.7 tbi and see 15MPG highway with the Tahoe!  11 MPG is typical
around town and that's driving very nicely.  Not even the factory
thinks they get 15MPG city/ 24 MPG highway.

Dan L

> Just for the record I have an 89 suburban 5.7 tbi with a 3:73 rear. The
> only time I've ever done worse than 21 mpg highway (Imperial gallon) is
> one time when I closed the plug gap down to around .035". If I run the
> plugs around .100"-.125" I get significantly better milege. I  have been
> as high as 24 mpg. Around town I generally get 14 -15 mpg. Timing
> doesn't seem to be too critical for mileage, however, I usually run
> about 4 deg BTC static just for the response.
> 
> Dan Furgason