What is the realistic accuracy & precision of typical consumer MPG calculations (tripmeter miles/pump gallons)

What was the lowest speed you could use 5th gear in the 75 car?

Can't remember for sure, but it was a DOG at 60mph - requiresd a downshift to get anywhere. I think hey geared the 75 GT the same as the 4 speed. I know I was shocked by the mileage on that trip - going out to Kingston to pit crew for Taisto Heinonnen, "The Flying Fynn" and Tom Burgess on the Twin Lakes Rally. Crewsd for him on the Tall Pines and the Blossom too.

I was offered his backup Celica Team car in 1980 when we finished rallying in the navigational rallye series (After finishing 1st, second and third in 3 years we were no longer elligible) and our R12 was not adequate to run competetively in the performance series but I decided to quit while I was ahead, since I was getting married.

I had the misfortune to own a '71 Audi when the 55 mph national speed limit went into effect. The German engineers thought 55 was a very brief period on your way to cruising speed not a speed you'd try to drive.

As it goes, if you want the best gas milage, you should always get into the highest gear as early as possible. You can shift into top gear at almost any speed. Well, I wouldn't do it below 25 MPH.