"The new Top Gear is a hit. OFFICIALLY. 23% audience share. 12% MORE than the opening episode of the last series. These are the FACTS," he wrote.
"Top Gear audience grew throughout the hour. FACT. Won its slot. FACT. Still number one on iPlayer. FACT. These are THE FACTS folks."
He said in a third tweet: "Top Gear series 1 episode 23, catch it again tonight 7pm BBC2. That's when it's on. FACT."
LeBlanc, 48, who escaped most of the online barbs, has yet to comment.
The first episode kicked off with a light-hearted dig at Clarkson, who was sacked for an "unprovoked physical and verbal attack" on a producer, apparently over catering.
During Evans' opening segment he introduced a group of people from an Indian restaurant and asked the audience what they thought they were doing there.
One person suggested they were there to prepare the food, and Evans, 50, said: "We don't talk about catering on this show any more".
Evans visited a US Naval Base where he raced a Dodge Viper ACR against a Corvette Z06, and LeBlanc was seen trying out an Ariel Nomad in the Moroccan desert. The pair also raced from London to Blackpool in roofless Reliant Rialtos.
Chef Gordon Ramsay and actor Jesse Eisenberg became the first celebrities on the leaderboard after racing a Mini Cooper around the track.
Within minutes of Top Gear starting, viewers were expressing their dismay via social media.
There were calls for the return of Clarkson and his co-presenters Richard Hammond and James May.
The popular trio will be back with a new Amazon Prime motoring show called The Grand Tour, which will make its debut on the streaming service this year.
TV presenter Carol Vorderman was among those to comment online.
She tweeted: "Sorry #TopGear ... switching off ... looking forward to the proper boys on @amazonprimenow soon ... night all xxx."
Ratings show the episode failed to reach the viewing figures of the last series.
It drew 4.4 million viewers, with a peak of 4.7 million, while the last series ended with 5.8 million viewers.
It was still the most-watched show in the 8pm time slot however, beating Antiques Roadshow on BBC One and ITV's British Soap Awards.
- AAP