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My grandma's corolla wagon with the 3TC engine and a 3 speed auto struggles to do better than 18-20MPG. It's curb weight is just under the 2000 pound mark.
With these older tech cars, you have to remember that with very few exceptions, carburettors are very inefficient compared to even older fuel injection systems. This is not so much that they give the car more gas than it needs all the time, just that there are times when a fuel injection system can drastically reduce or even cut off the fuel while a carburettor cannot.
In addition, until recently automatic transmissions couldn't match a manual in terms of economy. Also, since you have a 3 speed, there is no overdrive (if the top gear has a lower than 1:1 ratio it's not by enough to make a difference). At 70kph overdrive would make a difference.
Adding in age-related factors, it would easily explain the mileage you are getting.
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Toyotas in the family/next of kin:
1982 Corolla Wagon, 1989 Corolla DX, 1991 Previa LE, 1993 Previa LE,
1993 Pickup, 1994 Corolla DX, 1995 Avalon XL, 1996 Camry XLE, 1998 Avalon XL,
1998 Sienna CE, 1999 Camry XL, 2000 Camry XLE, 2002 Tundra, 2003 Tundra,
2003 ES 300, 2004 Camry XLE, 2005 Tacoma
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