That car was a 5 speed and 25 on the highway is no problem. Around town will be 15 to 17 depending how you run it. My wifes 400E gets much better mileage than my TE.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K