Southgate was keen to give all his 23-man squad playing time and there were debuts for Liverpool right back Trent Alexander-Arnold, who started before making way for Kieran Trippier, and Burnley goalkeeper Nick Pope, who came on for Jack Butland in the 65th minute. BBC say 4%, but should it be higher?
"I have got 11 or 12 that are going to be hard to leave out because there is genuine competition for places", Southgate said.
England's victory in Leeds followed Saturday's 2-1 win over Nigeria but perhaps more importantly, Southgate's squad appear to have avoided picking up any injuries as they prepare to fly to Russian Federation. "If I was thinking I have nobody to play here or there, it would be a very different situation".More news: US Special Forces attacked in Somalia by Al-Shabab
The dismissal of Costa Rica with substitute Danny Welbeck adding the second goal meant the hosts extended their unbeaten run to 10 games, going back almost a year.
But after travelling to Euro 2016 after bursting onto the scene as an 18-year-old two years ago, Rashford believes that his reduced workload last season has made him fresher ahead of the World Cup.
"You can see that a lot of the lads are confident".
Rashford's dipping drive on 13 minutes was the highlight of an all-round satisfactory evening for Southgate as the hosts extended their unbeaten run to 10 games, stretching back almost a year. It wasn't first team against Nigeria and second team today.More news: EA Play 2018's Layout Holds a Secret Surprise
However, both started the Three Lions' friendly victory against Nigeria at Wembley last weekend, and Lingard believes they can thrive as a potent pair in Russian Federation when the tournament gets underway.
Next up for England will be their World Cup opener against Tunisia on June 18th, so here are five things we learned from their final World Cup warm-up match.
Rashford end the club season with a career-best 13 goals for United, while his latest effort for England means that he now has three for his country in 19 appearances.
And with Leeds graduates Danny Rose and Fabian Delph in the starting line-up alongside fellow Yorkshire natives Jamie Vardy, Harry Maguire and John Stones, the Elland Road regulars had plenty of their own to cheer as Gareth Southgate's side eased to a fairly routine victory. I felt like I got better service, I got the ball better.More news: At Shanghai Cooperation Organisation Summit, India-Uzbekistan Discuss Bilateral Ties
England had won the World Cup in 1966 on home soil, beating bitter rivals Germany 4-2 in the final, courtesy a hat-trick by Geoff Hurst and a controversial third goal awarded to the hosts by Swiss referee Gottfried Dienst.