Patty,(and Hope)
I've "googled it" too. The top three hits link you to this board. I looked at half a dozen others on the first page. All said "injections are given sub-q". But none of them had anything to say one way or the other regarding IM injections.
Regardless, it doesn't matter. I was given instructions by my vet, who I trust, to give the injections IM until Bob is no longer getting sub-q lactated ringers treatment. So I plan on following her instructions for another 10 days or so. At that time, I plan on going back to sub-q because that is what she told me I should do.
I know you and others are just trying to be helpful. But actually it is unsolicited advice. I didn't post a thread saying "hey, are IM injections an option?" If I had, I'd be doing so because I had doubts, and I would be welcoming everyone's advice. But I didn't. Again, I know people here are zealous in giving advice, and I can appreciate that. Most of you have been dealing with this with varying degrees of success (most very successful) for months or years. I, for instance, am pretty sure that I have more knowledge and experience in dealing with rehab/hand-raising/releasing Virginia Opossums than 99.9% of the people here, and most people in the country. That's because I have many years of experience in doing that. But I wouldn't dream of telling you how to rehab a possum, or go to some opossum message board and post advice unless someone directly asked for it. (If you do have questions about wildlife rehab of possums, I'd be happy to help

)
I'll give you a perfect example of "google" and how unsolicited advice can be useless or harmful. Just now, when googling "insulin injections in cats", I ended up linked to this article on Yourdiabeticcat.com :
II. Proper insulin
Protamine zinc insulin is, by far, the most effective form of insulin available for use in the diabetic cat today. Beef and pork insulin molecules (beef is closer than pork) more closely resemble natural feline insulin and give the greatest response for the lowest dosages in the vast majority of feline diabetics. It can be dosed at 6-12 hour intervals and, because many canned or pouched cat foods are supportive of low blood glucose from diet, PZI allows good control of the diabetic cat, far superior to that from NPH, Humulin insulin or the newer human products called Lantus (glargine) or Levemir.
I use PZI. I know that here, that seems to be in the minority, and that most people seem to use Lantus or Levemir. But suppose on several posts where newbies posted for the first time and said "my vet says I'm going to be using Lantus." , I were to post that quote and say "No, use PZI because I read that it is far better!" She didn't ask for advice, just said she was told to use lantus.
One, I'd piss off dozens or more lantus or levemir users here,
two, I make the newbie doubt what her vet (who she may have been using for years) is telling her,
and three, I might be causing harm to the most important thing involved - her beloved kitty.
If that makes me sound like a jerk, I'm sorry. I'm not trying to be one. I have asked for advice on a couple things in other threads, and I'm truly greatful for all of the responses I've gotten. And I hope I can continue to ask questions and get a lot of positive feedback.
For whatever reasons, whether it's recommended or not, the IM injections for the past weeks have had a great deal of success in treating Bob's disease. His numbers for the past week have ranged from 69 to 160. Today they were 91 and 150 at meal and shot time. At +4 tonight it was 86. I'm not going to fix what seems to be working without asking the vet and having her tell me I might want to do that.
Carl in SC