I remember seeing the same stats/data from the TV stores that l2 mentioned. But rather than having some arguable cost differential be the determining factor in which version of cart to buy, I'd offer that you should prioritize what things are most important to you. If you have "range anxiety".......if no odor and quiet are important........if "gas and go" is appealing.......and so on - let these things drive your decision. The 'value' that someone perceives from a relative expensive purchase doesn't always come down to dollars-and-cents.
Bill