Fernando Alonso says he and McLaren are counting down the days until the end of the 2015 Formula 1 season after a difficult maiden campaign with the return of Honda and its underwhelming power unit.

Despite the two-time F1 World Champion believing the team has made progress in all areas throughout the season he is looking to put 2015 behind him and concentrate on McLaren's efforts for next year.

Alonso suffered another mechanical failure in Mexico after McLaren discovered a MGU-H problem the night before the race. With no time to replace it, Alonso said he knew he would begin the race with a very slim chance of finishing and his Grand Prix duly lasted just three corners before the problem became terminal and he was forced to retire on lap one.

"The car has been improving from race to race, we're progressively getting more competitive all year," Alonso said. "There's a bit of mixed feelings now, because with the season coming to an end, we had a lot of frustrations running at the back if the field, so we want the championship to end.

"But given the progress we've been making in every race we also wanted to carry on because we're on a very positive path. Let's hope that progress doesn't stop with the break and that we keep improving for next year."

The Spaniard has suffered seven retirements in 2015 so far (second-highest of any driver and one behind Pastor Maldonado), albeit not all of them down to mechanical problems, and is ready to end his difficult campaign on a high to add to his two points finishes.

"The car is improving this year and definitely the trend is positive and the car is improving every race in all the aspects; chassis, aerodynamic and engine," he said. "We are moving in the right direction. We have some high hopes for next year that it will be very different to 2015, well we hope so, and we are all working towards that.

"The next three or four months are very, very important and we are all united through the tough times and through the good times very, very soon."