No doubt A/C would be a big factor in power & fuel usage if you use it often. The Telstar/626 is not a light car (the TX5 hatchback more so), couple that with a carby motor & auto and extras such as A/C and they really are underpowered for Aussie conditions.
In regards to gearbox/diff in the TX5. I dont have the specs here but I would doubt they would be much differant to other models - no overdrive and a diff ratio that has the motor doing near 3500 at 110kph (South Australian speed limit) is not condusive to good fuel consumption!
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'94 EF GLI
Dash Mat
Color-coded Ashtray
Polished Wheel Nuts
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