I don't have any personal experience with EBRs (yet) but your mileage seems awfully low to me. Don't they have 4.5 gallon tanks? 100-110 miles equates to 22-24mpg. If you're only going 100-110 miles between fill-ups, the low fuel light must come on VERY early...either that or the exhaust/ecm upgrade has a much larger impact on fuel economy than you expect.