Two LPG powered Ford Focus STs will race in this year's British Touring Car Championship.
The cars will be run by the race-winning Arena Motorsport team and driven by race winners Tom Onslow-Cole and Tom Chilton.
The team scored three podium finishes running the cars with conventional petrol engines last season.
It made the decision to switch to LPG following a series of back-to-back tests of the petrol and LPG cars at Guadix in Spain.
"We're looking forward to the season with the Calor-powered Focus," said Earle.