This will give a more accurate measurement for fitting your space with a new oven. Gas ovens require a 110V line in the rear of the cabinet. This will ignite a new wall oven. Pilot light ovens are becoming a thing of the past. This will leave more air space around the appliance.
Electric ovens are the more preferred cooking system.
There has been more advancements in electric cooking systems. Such as convection and microwave convection combinations. Other advancements include electronic clocks and timers with combination cooking systems such as microwave, thermal and convection cooking. A Convection oven is a more desired oven for the serious cook. Convection ovens have a forced fan circulating hot air enabling food to cook faster and more evenly.