I put 33's on my LC as soon as I got it. This goes for both my first 91 and my current 96. Both would give me 11.5 mpg. Even after the supercharger, 11.5 mpg. Premium, light foot, heavy foot, city, highway, whatever. Nothing would never change it. And I still got 11.5 with the 35's. Nothing mattered it seemed.
To my suprise, (I had to run through 2 tanks to verify I wasnt seeing things) the 4.88 gear swap has made my engine more efficent to the point that I am now getting 14.5 mpg! I knew the engine wasnt working as hard anymore and was happy driving in the power band but what a nice result. Saves me about $450 in annual gas costs.
I told the about how this was money well spent and how it will pay us back. Now I need to try and apply that logic somehow to a rear bumper/tire carrier ....
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Originally Posted by bull How did you measure your mileage? Speedo? GPS?
Bit me in the butt.....of course I should of done the readings before and after with a gps unit. After reading your post I realize that I rushed to judgement. As the stock ring and pinion set up with the 33's gave me lower speedometer (therefore also odometer) readings, I was actually registering less odo miles than actual which in turn gave me lower miles per gallon used. Now with the 4.88's I am reading the opposite of approx 8-9% OVER actual so I am getting fat odometer reading over actual and perception that I am traveling farther per gallon used. Between the two dispcrepancies is where I am sure the difference lies. Sorry folks. I didnt look before I leaped on this one. :whoops:
It still feels good to fool myself.....Ill have to get the gps unit to see what the real mpg is. I figure it must be at least a tiny bit better due to driving more in the powerband than before.
about how this was money well spent and how it will pay us back. Now I need to try and apply that logic somehow to a rear bumper/tire carrier ....
