I'd say he's right - my guy told me not to do that expensive "fuel system cleaning" that places like Jiffy Lube offer - just go to a Chevron station and spend 3 or 4 bucks on a small bottle of their fuel injection additive.
Yep, he also says that Techtron is the best of the injector cleaners.
I keep reasonably accurate tabs on my mileage, and since switching to 100% Chevron in February, I have seen an honest 15%+ improvement in gas mileage. That's not insignificant.