Ihlefeld died on 8 August 1995 in Wennigsen, Lower Saxony. His ashes were buried on the urn field near the chapel on the old cemetery in Kirchheim unter Teck, Baden-Württemberg. Matthews and Foreman, authors of "Luftwaffe Aces — Biographies and Victory Claims", researched the German Federal Archives and found documentation for 122 aerial victory claims, plus five further unconfirmed claims. This number includes nine claims during the Spanish Civil War, 48 on the Western Front, including three four-engined bombers, and 65 on the Eastern Front. Victory claims were logged to a map-reference (PQ = "Planquadrat"), for example "PQ 05 Ost S/ET-1". The "Luftwaffe" grid map () covered all of Europe, western Russia and North Africa and was composed of rectangles measuring 15 minutes of latitude by 30 minutes of longitude, an area of about . These sectors were then subdivided into 36 smaller units to give a location area 3 × 4 km in size.