2009, May 10, Christopher Jensen, Critics Find Flaws in the Case Made by Ethanol Advocates, Growth Energy sent the entire report to the E.P.A., but the summary it provided with its formal waiver request — and uses in press materials — said that when using E15 and E20, “there were no significant changes in vehicle tailpipe emissions, vehicle drivability or small nonroad engine emissions as ethanol content increased.â€