I got curious and read into the turbine engine used in the Abrams. 1500 horsepower at the shaft. Something I found very interesting- it runs on many fuels, including diesel! In fact the Australians run their Abrams on diesel.
In terms of performance, it’s a hell of a tank engine. Quick response, easy cold starts, etc. In terms of reliability and MTBF it’s not great. Turbine engines excel in aircraft, up in the clean air, where objects and debris don’t get sucked into to them. A tank’s reality is very different; the turbine blades are prone to erosion even though the engine has an elaborate air filtration system.
It makes for a high performance, high-strung, race car of a tank. VERY capable.... when it’s working right. Is it up for continuous frontline combat duty in Ukraine? Seems unlikely to me. I think that‘s a big reason the US hesitated: they’re going to be a bit embarrassing.