Michael,
That was what I was getting before I switched to the TBI set-up. Now I
am around the 22mpg mark, sometimes slightly above, sometimes slightly
below. For trips or extended backroad driving it goes up in the high
20's, even close to 30mpg. Most of the improvement I can attribute to
this set-up since I kept track of mileage since I purchased the car
used and in need of a great deal of mechanical rebuild. Some repairs
have improved gas mileage also, such as rebuilding the carbs before I
switched over to the TBI set-up but nothing compared to the gas mileage
increase from that sole modification. With my other vehicle being a 94
Mazda B4000 PU with a 4.0 liter V6 the TR6 is an improvement in gas
mileage.
Aaron
Aaron Cropley
71 TR6 (Throttle Body Injection!)
http://www.triumphowners.com/108
Topsham, Maine
-----Original Message-----
From: SamuelsMA@aol.com
To: 6pack@autox.team.net
Sent: Sun, 30 Apr 2006 22:44:28 EDT
Subject: Speedometer/Odometer
Listers:
I have an interesting conundrum for the list relating to
speedometer/odometer function. First, the story starts with the fact
that I
calculated my gas
mileage for the first time a few days ago. The car is a '76 with twin
Z-S
carburetors and some high-performance modifications including a 9.5 to
1
compression, a cam, headers, porting, lightened flywheel, electronic
ignition,
etc.
It takes premium unleaded at $3.30/gallon. With combined highway/city
driving, I calculated 18 mpg, which is just about exactly what my 2002
Jaguar
XJ
Sport (XJ8) gets!
Anyway, it occurred to me that I didn't know if either my speedo or
odometer
was accurate, which would affect my calculation. So I had my son
drive his
2005 Jetta on the highway and set a speed of 60 mph on a straight
stretch. I
stayed behind him, neither gaining nor losing ground. My speed read
59.5,
which is close enough for me. However, we set our trip odometers at
the
beginning and end of the trip, and mine read 4% low compared to his.
My question is, why would our speedometers agree almost perfectly, but
our
odometers be different by 4%? Also, is 18 mpg (or really 17, when you
take
the odometer inaccuracy into account) in mixed driving (but plenty of
highway at
about 65 mph) similar to others with similarly modified, non-overdrive
cars?
Thanks!
Michael
'76 Tahiti blue
CF 57044U
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