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The new, lower-emission purpose-built TX4 taxi by LTI Vehicles is not only cleaner than previous versions (as we reported when the TX4 was released last fall), it's also proving popular with cabbies and passengers. At least, so says LTI.

Launched three weeks ago by LTI Vehicles, the next generation of purpose-built London taxis, the TX4, is now available on Edinburgh streets. The TX4 looks like previous generation London taxis, but under the hood and inside the cab there have been some changes. Most interesting for us is the lower-emissions, Euro IV compliant VM turbodiesel engine, which puts out either 211 grams of CO2 per kilometer with a manual transmission version or 233 gm/k with an automatic. Combined mileage numbers are 3