Some interesting numbers in this thread. Certainly the
~50mpg number is under ideal circumstances, but possible.
A starting point for the YCV (Yank Conversion Factor)
should be on the order of 0.777 though. This is based
on 0.833 for Imperial/U.S. gallons and 0.933 for
3.63/3.89 final drive ratios.
Add to this-
The (dry) weight difference (on the order of):
U.S. = 799kg.
U.K. = 763kg.
Depending on the source, options and model year.
(Tom, you forgot the heavy front number plate plinth ;-)
It is harder to find a number to represent the mpg
difference due to the "detuned" U.S. motor and it's
attendant emissions kit, but it would be significant.
The drag coefficient is lowest with the hardtop on.
Add a coat of wax and it's absolutely amazing.
This obviously has more impact on mpg at higher
speeds, and ultimately determines top speed.
Around town, the added weight of hardtop and wax,
probably reduce mpg.
FWIW I'm currently getting about 30mpg, city driving
(U.S. spec car/gallon with SU HS4s and U.K. exhaust)
and about 25 mpg, city driving with another U.S. spec
car running Weber DGV/ 4-1 header.
Of course (I can't resist) YMMV.
--
LBC'ing U,
Bob (& Spitfires)
[digest mode]
http://home.att.net/~stan.part
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