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The colder an engine is, the more fuel it needs (generally speaking). If your engine isn't warming up properly, it will need and burn more fuel over the long run.
Why was the T-stat replaced? Some of them work better than others.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.