Quote:
Originally Posted by Old Mechanic
I believe his figures are possible...
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They are possible in that car, but not at 65mph average. At 65mph, it takes far more energy per mile to drive a Saab through the air.
Using P&G, operating the engine near peak BSFC or not at all, I was able to achieve almost 50mpg in my Subaru Legacy on ideal terrain - at 35mph.
DriveStick - the techniques you use do save fuel, and your Saab has pretty good aerodynamics. I'm sure you got pretty good mileage, but I
would expect something in the low 30's with cruise control, low 40's with the P&G that you used. I have to admit a lightened Saab is better configured for this sort of driving than I had realized, for the reasons OldMechanic mentioned.
Fuel pumps are known to deliver inconsistent fills (just ask anyone at a fuel economy run), and extraordinary claims require extraordinarily careful data gathering.
So for now, congratulations on what is in any case an impressive result. Now let's wait and see if your next fill comes up long.