Tab,
You will get a slight increase in gas mileage, but just because the
engine is spinning 18% slower does not mean you will get 18% better gas
mileage. More like 2% or so, because the engine is still putting out
the same amount of power (i.e., "work") to move the car at the same
speed, just doing it at a slightly more efficient part of the power
curve.
The primary value of the overdrive IMHO is the reduced noise level at
road speed, which it does rather well. You will also get more miles out
of the engine, maybe even the 18% more you were hoping to get on your
gas mileage! With your commute the relative peace and quiet are
justification alone, and $1200 for an OD tranny including installation
is a pretty good deal! Is there any warranty on it?
--
Stuart MacMillan
Seattle
'84 Vanagon Westfalia
'65 MGB (Driven since 1969)
'74 MGB GT (Restoring)
Assisting on Restoration:
'72 MGB GT (Daughter's)
'64 MGB (Son's)
Parts cars:
'68 & '73 MGB, '67 MGB GT
|