Lotus third and reserve driver Jolyon Palmer says despite a productive testing day it was tinged with sadness as it marks his final in-season test in the Lotus E23 Hybrid in 2015.

The 2014 GP2 champion notched up 110 laps on Wednesday at the last in-season F1 test of the year at the Red Bull Ring and ended the day sixth on the timesheet with a fastest lap of 1m 10.373s, 1.2s of pace-setter Nico Rosberg.

Focusing on aerodynamic evaluations and setup work, Palmer says when he jumped out of the car at the end he felt slightly downbeat.

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"It was a good day for me and we completed all of our programme," Palmer said. "It's always productive to get a good tally of laps on the board so anything over one hundred is a real bonus. It's a bit sad as that's my final day of testing in the car, but I've got a good schedule of FP1 sessions ahead of me, starting with my home Grand Prix at Silverstone next week."

Lotus trackside operation director Alan Permane says he was thrilled by the remarkable reliability of the E23 Hybrid at the hands of the British driver and the team heads to its home Grand Prix in high spirits.

"The E23 ran reliably and Jolyon did a great job as expected," Permane said. "We've been able to collate useful data for improving the pace of the E23 which means job done. We now head back to Enstone to prepare for our home Grand Prix at Silverstone."