I installed the EBH based more on my data from the Prius. The HiHy is my wife's vehicle and she's not nearly as diligent about record keeping...plus we'd only run 3 tanks of gas through it before I put the EBH in and those were all atypical driving conditions compared to our usual daily commute.

The hit on the electric bill is pretty small as it draws less than 600W and we'll use it on a timer for about 2-4 hours in the morning only in the winter. When we're skiing in Colorado we may leave it on all night...but we don't pay that bill!

Evan E. Fusco, MD
'04 Prius/BC moded to the T
'06 Highlander Hybrid Limited AWD w/NAV